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Delaware's Historic Preservation Office (DHPO) is a vital institution committed to safeguarding the state's rich cultural and historical heritage. Established in the mid-20th century, the DHPO works to identify, protect, and promote Delaware's historic resources, ensuring that landmarks, buildings, and traditions remain intact for future generations. Through partnerships with local governments, private organizations, and the public, the office plays a central role in preserving the architectural, archaeological, and cultural legacy of Delaware. Its efforts span a wide range of activities, from granting historic designation to sites like the Brandywine Valley to providing grants for restoration projects. The DHPO also collaborates with [[Delaware's Department of Natural Resources and Environmental Control]] to manage state parks and historic sites, reflecting its broader mission of balancing preservation with public access. This article explores the history, geography, culture, and significance of the DHPO, as well as its impact on Delaware's economy, education, and communities.
{{Infobox government agency
| agency_name = Delaware Historic Preservation Office
| formed = 1966
| jurisdiction = [[Delaware]]
| parent_agency = [[Delaware Division of Historical and Cultural Affairs]], [[Delaware Department of State]]
| website = {{URL|history.delaware.gov}}
}}


== History == 
The '''Delaware Historic Preservation Office''' (DHPO) is a state agency responsible for identifying, protecting, and promoting Delaware's historic resources under the administrative umbrella of the [[Delaware Division of Historical and Cultural Affairs]], which is a component of the [[Delaware Department of State]].<ref>[https://history.delaware.gov "Delaware Division of Historical and Cultural Affairs"], ''history.delaware.gov''.</ref> The office administers Delaware's participation in the federal historic preservation program established by the [[National Historic Preservation Act of 1966]], coordinating nominations to the [[National Register of Historic Places]], reviewing federally funded projects for their effects on historic properties, and distributing federal preservation grants to property owners, local governments, and nonprofit organizations. Its work spans the full geographic range of Delaware, from the colonial streetscapes of [[New Castle, Delaware|New Castle]] and the industrial corridors of Wilmington to the agricultural landscapes of the Delmarva Peninsula and the maritime communities along Delaware Bay.
The origins of Delaware's Historic Preservation Office trace back to the early 1950s, a period marked by growing awareness of the need to protect the state's historical resources amid rapid urbanization and development. The office was formally established in 1957 under the Delaware Historical and Architectural Preservation Act, which laid the groundwork for systematic preservation efforts. This legislation empowered the DHPO to designate historic sites, regulate alterations to significant buildings, and provide financial incentives for preservation. Over the decades, the office has evolved in response to changing priorities, such as expanding its focus to include intangible cultural heritage and community-driven preservation initiatives. A pivotal moment came in the 1970s with the passage of the National Historic Preservation Act, which reinforced the DHPO's role within the broader federal framework. Today, the office continues to adapt, addressing challenges like climate change and demographic shifts while maintaining its commitment to Delaware's past.


The DHPO's historical significance is further underscored by its role in documenting and interpreting Delaware's diverse heritage. From the 18th-century colonial architecture of the First State to the industrial sites of the 19th century, the office has worked to ensure that these landmarks are not only preserved but also understood. For example, the office's collaboration with the [[Hagley Museum and Library]] has helped preserve the legacy of the DuPont Company, a cornerstone of Delaware's industrial history. Additionally, the DHPO has been instrumental in recognizing the contributions of marginalized communities, such as the African American neighborhoods in Wilmington, through its designation of historic districts. These efforts highlight the office's dual mission of conservation and education, ensuring that Delaware's history remains accessible and relevant.
Statutory authority for the office derives from Delaware Code Title 7, Chapter 53, which governs historic preservation in the state.<ref>[https://delcode.delaware.gov/title7/c053/ "Delaware Code Title 7, Chapter 53: Historic Preservation"], ''Delaware General Assembly''.</ref> Through grants, tax incentives, regulatory review, and public education programs, the DHPO works with local governments, private property owners, nonprofit organizations, and federal agencies to preserve the architectural, archaeological, and cultural resources that document Delaware's history.


== Geography ==
== History ==
Delaware's unique geography, characterized by its coastal plains, inland valleys, and river systems, has shaped the state's historical and cultural landscape. The DHPO's work spans these diverse regions, from the historic seaports of Lewes and Rehoboth Beach to the agricultural heartlands of the Brandywine Valley. The office's geographic focus includes both urban and rural areas, reflecting Delaware's varied historical narratives. For instance, the Brandywine Valley, home to the [[Winterthur Museum, Garden and Library]], is a focal point for preserving 18th- and 19th-century architecture and industrial heritage. Similarly, the Delmarva Peninsula's coastal communities have been prioritized for their maritime history, with sites like the [[Cape Henlopen State Park]] serving as key examples of the DHPO's preservation efforts. 


The DHPO's geographic strategy also involves collaboration with local governments to address regional preservation needs. In the northern part of the state, the office has worked closely with the city of Wilmington to protect its historic downtown, which features a mix of Federal and Victorian-era buildings. Meanwhile, in the southern counties, the DHPO has focused on preserving the legacy of the state's agricultural past, including the 19th-century farmsteads that dot the landscape. These efforts are supported by the office's use of geographic information systems (GIS) to map and analyze historic sites, ensuring that preservation initiatives are both efficient and equitable. By integrating geographic data with community input, the DHPO continues to expand its reach across Delaware's diverse terrain.
Delaware's formal commitment to historic preservation developed alongside the broader national movement that emerged after World War II, as rapid suburbanization and urban renewal projects threatened historic buildings and landscapes across the country. The state's early preservation efforts were largely ad hoc, driven by civic organizations and historical societies rather than a coordinated government program. That changed in 1966. The passage of the [[National Historic Preservation Act]] that year created the framework for a nationwide network of State Historic Preservation Offices (SHPOs), and Delaware moved to establish its own office in compliance with the federal mandate.<ref>[https://www.nps.gov/subjects/historicpreservation/national-historic-preservation-act.htm "National Historic Preservation Act"], ''National Park Service''.</ref> The act required each participating state to survey historic properties, maintain a statewide inventory, nominate eligible properties to the National Register, and review the effects of federally assisted projects on historic resources. It's worth noting that earlier dates sometimes cited for the DHPO's founding, including references to a 1957 enabling act, have not been confirmed by the agency's own documentation and should be treated with caution until primary sources verify them.


== Culture == 
The [[National Historic Preservation Act]] also established the Section 106 review process, which requires federal agencies to consult with SHPOs before approving projects that might affect properties listed on or eligible for the National Register. This function became one of the DHPO's most consequential roles. Thousands of federal undertakings, from highway construction to telecommunications projects, require DHPO review annually, giving the office significant influence over land use and development decisions throughout Delaware.<ref>[https://www.achp.gov/protecting-historic-properties/section-106-program/introduction-section-106 "Introduction to Section 106"], ''Advisory Council on Historic Preservation''.</ref>
Delaware's cultural heritage is a tapestry woven from colonial, industrial, and contemporary influences, all of which the DHPO seeks to preserve. The office plays a critical role in safeguarding traditions, artifacts, and intangible cultural expressions that define the state's identity. For example, the DHPO has supported the documentation of Delaware's folk music and crafts, working with local artisans to ensure that these practices are passed down through generations. Additionally, the office has been instrumental in preserving the state's African American heritage, recognizing sites like the [[Bellefield Historic District]] in Wilmington as vital to understanding Delaware's role in the Civil Rights Movement.


Cultural preservation under the DHPO's purview also extends to festivals and events that celebrate Delaware's history. The office collaborates with organizations to sponsor events such as the [[Delaware Heritage Days]], which showcase the state's historical milestones and cultural diversity. These initiatives not only educate the public but also foster a sense of community pride. Furthermore, the DHPO has partnered with universities and museums to create exhibits that highlight underrepresented aspects of Delaware's past, such as the contributions of Indigenous peoples and immigrant communities. By integrating cultural preservation into its broader mission, the DHPO ensures that Delaware's heritage remains a living, evolving narrative.
In the decades following the office's establishment, its scope expanded considerably. The 1970s and 1980s brought growing recognition that historic preservation needed to account for underrepresented communities whose heritage had been largely absent from earlier designation efforts. The DHPO began actively working to identify and document African American historic sites in Wilmington and elsewhere in the state, as well as the landscapes associated with Indigenous peoples and immigrant communities. A parallel expansion occurred in the archaeological program, as the office developed standards for archaeological surveys required under Section 106 and for state-funded projects.


== Economy == 
The office also played a central role in documenting Delaware's industrial heritage. Working with institutions like the [[Hagley Museum and Library]], the DHPO helped preserve the legacy of the DuPont Company's early manufacturing operations along the Brandywine Creek, including powder mills and worker housing that represent some of the earliest large-scale industrial complexes in North America.<ref>[https://www.hagley.org/research/finding-aids "Collections and Research"], ''Hagley Museum and Library''.</ref> Today the office continues to adapt its programs, addressing emerging challenges including the effects of climate change on historic properties and the need to integrate digital survey tools into its statewide inventory work.
The economic impact of Delaware's Historic Preservation Office is multifaceted, encompassing tourism, job creation, and the revitalization of historic districts. By preserving and promoting historic sites, the DHPO contributes to the state's tourism industry, which is a significant source of revenue. For example, the [[First State Heritage Park]] in Dover attracts thousands of visitors annually, generating income for local businesses and creating employment opportunities in hospitality, retail, and services. The office's grants and tax incentives for historic preservation also stimulate private investment, encouraging property owners to restore and maintain historic buildings. This, in turn, enhances property values and fosters economic growth in historically significant areas.


In addition to direct economic benefits, the DHPO's work supports long-term sustainability by preserving infrastructure that might otherwise require costly replacement. For instance, the restoration of 19th-century bridges and roads not only maintains their historical integrity but also reduces the need for modern infrastructure projects that could disrupt local economies. The office also collaborates with the [[Delaware Tourism Board]] to market historic sites as part of the state's cultural tourism strategy, further boosting visitor numbers and economic activity. These efforts underscore the DHPO's role as a catalyst for both heritage conservation and economic development. 
== Administration and Legal Authority ==


== Attractions == 
The DHPO operates within the [[Delaware Division of Historical and Cultural Affairs]], which sits under the [[Delaware Department of State]] rather than the Department of Natural Resources and Environmental Control. This distinction matters practically: state historic sites and museums in Delaware are managed by the Division of Historical and Cultural Affairs, while natural resource lands are managed separately by DNREC. The DHPO serves as Delaware's State Historic Preservation Officer program, the point of contact between state government and the federal historic preservation system administered by the [[National Park Service]].<ref>[https://www.nps.gov/subjects/historicpreservation/shpo.htm "State Historic Preservation Offices"], ''National Park Service''.</ref>
Delaware's Historic Preservation Office oversees a wide array of attractions that highlight the state's historical and cultural significance. Among the most notable is the [[Hagley Museum and Library]], a National Historic Landmark that preserves the legacy of the DuPont Company and its impact on American industry. The museum's collection of artifacts, documents, and industrial equipment offers visitors a glimpse into Delaware's role in the chemical and manufacturing sectors. Another key attraction is the [[Winterthur Museum, Garden and Library]], which showcases 18th- and 19th-century American decorative arts and landscape design. These sites, protected through the DHPO's efforts, serve as both educational resources and tourist destinations, drawing visitors from across the country.


Beyond museums, the DHPO manages and promotes historic sites such as the [[Brandywine Battlefield Park]] and the [[Cape Henlopen State Park]]. The Brandywine Battlefield, a key location during the American Revolutionary War, features preserved 18th-century military encampments and interpretive exhibits that educate visitors about the state's role in the nation's founding. Similarly, Cape Henlopen State Park preserves the natural and historical heritage of Delaware's coastal region, including the remnants of early 20th-century lighthouses and maritime artifacts. These attractions, supported by the DHPO's preservation initiatives, ensure that Delaware's history remains accessible and engaging for both residents and tourists.
Delaware Code Title 7, Chapter 53 gives the DHPO authority to designate historic properties under state law, regulate alterations to state-designated landmarks, and administer grant programs funded through the federal Historic Preservation Fund. The office also coordinates with the [[Advisory Council on Historic Preservation]] in Washington when Section 106 reviews involve particularly complex or controversial undertakings. Locally, the DHPO works alongside municipal historic district commissions in cities like Wilmington and Dover, providing technical guidance on design standards and preservation best practices.


== Getting There ==
== National Register of Historic Places ==
Access to Delaware's historic sites and attractions is facilitated by a combination of public transportation, private vehicles, and regional partnerships. The DHPO works with local transit authorities to improve connectivity to key preservation sites, such as the [[First State Heritage Park]] in Dover and the [[Brandywine Valley]] in New Castle County. For example, the [[Delaware Department of Transportation]] has expanded bus routes to include stops near historic districts, making it easier for visitors to explore these areas without a car. Additionally, the office collaborates with tourism organizations to provide shuttle services during peak seasons, ensuring that historic sites remain accessible to a broader audience. 


For those traveling by car, the DHPO has developed detailed maps and driving guides to help visitors navigate Delaware's historic landmarks. These resources are available on the [[Delaware Department of Natural Resources and Environmental Control]] website and highlight scenic routes that connect multiple preservation sites. The office also partners with regional rail services, such as the [[Amtrak]] routes through Wilmington, to facilitate travel to historic areas. By enhancing transportation options, the DHPO ensures that Delaware's heritage remains within reach for all visitors, regardless of their preferred mode of travel.
Delaware has a substantial number of properties listed on the [[National Register of Historic Places]], spanning individual buildings, historic districts, archaeological sites, and cultural landscapes. The DHPO manages the nomination process for Delaware properties, evaluating whether sites meet the National Register's criteria for significance in history, architecture, archaeology, engineering, or culture, and whether they retain sufficient physical integrity to convey that significance.<ref>[https://www.nps.gov/subjects/nationalregister/how-to-nominate-a-property.htm "How to Nominate a Property"], ''National Park Service, National Register of Historic Places''.</ref> Nominations are reviewed first by the Delaware State Review Board for Historic Preservation before being forwarded to the National Park Service for final listing.


== Neighborhoods == 
Listed properties in Delaware range from the [[New Castle Historic District]], which preserves one of the most intact colonial-era town centers on the East Coast, to 19th-century farmsteads in Sussex County, 18th-century churches, and the industrial complexes of the Brandywine Valley. The [[Winterthur Museum, Garden and Library]] and the [[Hagley Museum and Library]] are both National Historic Landmarks, the highest designation within the National Register system, reflecting their exceptional national significance.<ref>[https://www.nps.gov/subjects/nationalhistoriclandmarks/index.htm "National Historic Landmarks Program"], ''National Park Service''.</ref>
Delaware's historic neighborhoods are a testament to the state's architectural and social history, many of which have been preserved through the efforts of the DHPO. One such example is the [[Wilmington Historic District]], a vibrant area in the city of Wilmington that features a mix of Federal, Victorian, and Art Deco buildings. The DHPO has worked with local residents and businesses to maintain the district's character while supporting economic development through grants and tax incentives. Similarly, the [[Dover Historic District]] in the capital city showcases 18th- and 19th-century architecture, with landmarks like the [[Old State House]] serving as a focal point for preservation efforts.


The DHPO's neighborhood preservation initiatives also extend to smaller towns and rural areas, where historic character is often intertwined with community identity. For instance, the office has supported the preservation of the [[New Castle Historic District]], which includes colonial-era buildings and the site of the first statehouse in the United States. In these neighborhoods, the DHPO collaborates with local governments to enforce historic preservation ordinances, ensuring that new developments complement the existing architectural landscape. These efforts not only protect Delaware's built environment but also foster a sense of continuity and pride among residents.
Listing on the National Register does not restrict what private property owners can do with their own property. It does, however, make them eligible for federal historic preservation tax credits, which provide a 20 percent income tax credit for the certified rehabilitation of income-producing historic buildings. The DHPO administers the certification process for these credits in Delaware, reviewing proposed rehabilitation plans to ensure they meet the [[Secretary of the Interior's Standards for Rehabilitation]].<ref>[https://www.nps.gov/subjects/taxincentives/index.htm "Federal Historic Preservation Tax Incentives"], ''National Park Service''.</ref>


== Education ==
== Section 106 Review ==
Education is a cornerstone of the Delaware's Historic Preservation Office's mission, as it seeks to instill an appreciation for the state's heritage in students, teachers, and the broader public. The office offers a range of educational programs, including school field trips, teacher training workshops, and curriculum resources that integrate Delaware's history into classroom instruction. For example, the DHPO partners with the [[Delaware Department of Education]] to develop lesson plans that explore topics such as the Underground Railroad and the state's role in the American Revolution
 
One of the DHPO's most active functions is administering the Section 106 review process under the National Historic Preservation Act. Section 106 requires federal agencies to consider the effects of their undertakings on historic properties before approving permits, issuing licenses, or disbursing federal funds. In practice, this means that virtually any project receiving federal money or requiring a federal permit, from road expansions and utility installations to telecommunications tower construction and federally funded housing rehabilitation, must be reviewed by the DHPO if historic properties might be affected.<ref>[https://www.achp.gov/protecting-historic-properties/section-106-program/introduction-section-106 "Section 106 of the National Historic Preservation Act"], ''Advisory Council on Historic Preservation''.</ref>
 
The review process begins with identification: federal agencies, often working with project applicants, must identify historic properties in the project's area of potential effect. The DHPO then assesses whether the project will have an adverse effect on those properties. If it will, the agency, applicant, DHPO, and other consulting parties negotiate a Memorandum of Agreement outlining mitigation measures, which might include archaeological excavation before ground disturbance, facade preservation, or documentation of buildings that can't be saved. Not every review results in conflict. Many Section 106 consultations conclude quickly when projects are designed to avoid historic resources or when no significant properties are present.
 
The Section 106 process has shaped major infrastructure decisions in Delaware. Highway realignments, bridge replacements, and redevelopment projects in historic downtown areas have all been modified through Section 106 consultation to reduce impacts on listed properties and historic districts. This regulatory role gives the DHPO influence well beyond its grant-making activities.
 
== Geography ==
 
Delaware's compact size belies significant geographic diversity, and the DHPO's preservation work reflects that variety. The northern part of the state, anchored by Wilmington and New Castle County, contains the highest concentration of urban historic resources: Federal-period row houses, Victorian commercial blocks, 20th-century industrial buildings, and the colonial streetscapes of [[New Castle, Delaware|New Castle]] itself. The Brandywine Valley, straddling the Pennsylvania border, contains a particularly rich concentration of 18th- and 19th-century country houses, mills, and designed landscapes, including the estates now occupied by [[Winterthur Museum, Garden and Library]] and other institutions.<ref>[https://www.winterthur.org/about/ "About Winterthur"], ''Winterthur Museum, Garden and Library''.</ref>
 
Central Delaware, dominated by Kent County and the capital city of Dover, preserves a different character: a mid-Atlantic agricultural landscape punctuated by 18th-century courthouse towns, plantation-era farmsteads, and the historic core of Dover itself, where the [[Old State House]] and Legislative Hall anchor a district that has been central to Delaware governance since the colonial period. Southern Delaware, comprising Sussex County, contains the state's greatest concentration of rural historic resources, including 19th-century farmsteads, small crossroads towns, African American churches and schools from the post-Civil War era, and the maritime communities along the Delaware Bay and Atlantic Coast.
 
The DHPO uses geographic information systems (GIS) to maintain and analyze its statewide inventory of historic properties, allowing staff to identify survey gaps, plan targeted fieldwork, and provide data to local governments and federal agencies conducting Section 106 reviews. Coastal areas present particular challenges. Rising sea levels and increasing storm intensity threaten historic resources in communities like Lewes and along the Delaware Bay shoreline, and the DHPO has been working to integrate climate vulnerability assessments into its survey and planning work.
 
== Climate Change and Historic Properties ==
 
Climate change poses a direct and growing threat to Delaware's historic resources, particularly in the coastal and low-lying areas that contain some of the state's most significant properties. Delaware is among the most vulnerable states on the East Coast to sea level rise, with projections from the National Oceanic and Atmospheric Administration indicating continued increases in tidal flooding frequency throughout the century.<ref>[https://oceanservice.noaa.gov/hazards/sealevelrise/sealevelrise-tech-report.html "Technical Report on Sea Level Rise"], ''NOAA''.</ref> Historic structures built in the 18th and 19th centuries were not designed with these conditions in mind, and repeated flooding causes cumulative damage to foundations, masonry, and wood framing that standard maintenance programs can't easily address.
 
The accuracy of existing flood zone designations is a legitimate concern. Federal Emergency Management Agency flood maps, which designate 100-year and 500-year flood zones, are updated periodically but often lag behind observed changes in flooding patterns caused by climate change and local development. Property owners in areas formally designated as low-risk have in some cases experienced repeated flooding events, raising questions about whether current maps adequately reflect actual risk to structures in those areas.<ref>[https://www.fema.gov/flood-maps/national-flood-hazard-layer "National Flood Hazard Layer"], ''Federal Emergency Management Agency''.</ref> For historic properties, this gap between official designation and experienced reality is particularly consequential: flood insurance decisions, grant eligibility, and local ordinance requirements are all tied to FEMA flood zone status.
 
The DHPO has begun incorporating climate resilience considerations into its technical guidance for historic property owners and into its survey prioritization. Preserving a building's historic character while improving its resilience to flooding is a challenge, since flood mitigation measures like elevating structures, installing flood barriers, or waterproofing masonry can conflict with the [[Secretary of the Interior's Standards for Rehabilitation]] that govern federally assisted preservation work. The office works with property owners and the National Park Service to identify approaches that protect historic integrity while reducing vulnerability. Still, the pace of adaptation in government programs has generally been reactive, responding to damage after major storms rather than systematically addressing risk before it materializes.
 
== African American Heritage ==
 
Delaware's African American heritage represents one of the DHPO's most important and historically underserved areas of preservation work. The state's history encompasses the full arc of the African American experience from enslavement through emancipation, the Great Migration, and the Civil Rights Movement, and significant physical resources associated with that history survive across all three counties.
 
In Wilmington, the DHPO has worked to identify and document historic African American neighborhoods, churches, and institutions, including resources associated with the city's role as a destination for African American migrants from the South during the early 20th century. Wilmington's African American community sustained a network of churches, fraternal organizations, and businesses that are documented in the statewide historic property inventory, though the level of formal National Register designation for these resources continues to lag behind their historical significance. That gap has been a focus of targeted survey work in recent years.
 
Rural Sussex County contains a particularly significant concentration of African American heritage resources, including the Colored School buildings constructed under the [[Julius Rosenwald Fund]] program in the early 20th century and the small rural churches that served as community anchors during the era of legal segregation. The DHPO has supported survey and nomination work focused on these resources, recognizing that their significance extends beyond Delaware to the broader national narrative of African American education and community institution-building.
 
== Economy ==
 
Historic preservation generates measurable economic activity in Delaware, both through direct tourism spending and through the private investment stimulated by preservation tax incentives. The federal Historic Tax Credit program, administered in part through the DHPO's certification process, has financed the rehabilitation of historic commercial and industrial buildings in Wilmington and other Delaware cities, converting underused structures into housing, office space, and retail uses that contribute to local tax bases.<ref>[https://www.nps.gov/subjects/taxincentives/index.htm "Federal Historic Preservation Tax Incentives"], ''National Park Service''.</ref> Studies of the federal tax credit program nationally have consistently found that rehabilitation of historic buildings generates more construction jobs per dollar invested than new construction, because rehabilitation is more labor-intensive and relies less on prefabricated materials.<ref>[https://www.nthp.org/issues/economics "Economic Benefits of Historic Preservation"], ''National Trust for Historic Preservation''.</ref>
 
Tourism tied to historic sites is a significant component of Delaware's visitor economy. The [[First State Heritage Park]] in Dover, a partnership among state agencies and nonprofit organizations that connects historic sites across the capital city, draws visitors to the Old State House, the historic Green, and other downtown landmarks. The Brandywine Valley's concentration of museums, gardens, and historic sites, including Winterthur and Hagley, attracts regional visitors who generate spending in hotels, restaurants, and retail. Cape Henlopen and the historic town of Lewes together form another visitor draw on the Atlantic Coast, combining natural heritage with a colonial-era townscape that the DHPO has helped protect through survey, designation, and technical assistance to local historic district boards.
 
Property values in designated historic districts in Delaware generally perform competitively with comparable non-designated areas, a pattern documented in studies of historic district economics nationally.<ref>[https://www.nthp.org/issues/economics "Economics of Historic Districts"], ''National Trust for Historic Preservation''.</ref> The effect is most visible in neighborhoods like the [[New Castle Historic District]] and portions of downtown Dover, where designation has helped stabilize property values and attract reinvestment.
 
== Attractions ==
 
The DHPO supports and promotes a range of historic sites and attractions across Delaware, though it's the Division of Historical and Cultural Affairs that directly manages many of the state-owned historic sites and museums. Among the most visited is the [[Hagley Museum and Library]], a National Historic Landmark occupying the site of E.I. du Pont's original black powder mills along the Brandywine Creek. The museum's collection documents the history of American industry and technology, and its restored mill buildings, workers' community, and Georgian-style residence offer visitors a detailed picture of early American industrial enterprise.<ref>[https://www.hagley.org/about "About

Latest revision as of 03:45, 18 May 2026

Template:Infobox government agency

The Delaware Historic Preservation Office (DHPO) is a state agency responsible for identifying, protecting, and promoting Delaware's historic resources under the administrative umbrella of the Delaware Division of Historical and Cultural Affairs, which is a component of the Delaware Department of State.[1] The office administers Delaware's participation in the federal historic preservation program established by the National Historic Preservation Act of 1966, coordinating nominations to the National Register of Historic Places, reviewing federally funded projects for their effects on historic properties, and distributing federal preservation grants to property owners, local governments, and nonprofit organizations. Its work spans the full geographic range of Delaware, from the colonial streetscapes of New Castle and the industrial corridors of Wilmington to the agricultural landscapes of the Delmarva Peninsula and the maritime communities along Delaware Bay.

Statutory authority for the office derives from Delaware Code Title 7, Chapter 53, which governs historic preservation in the state.[2] Through grants, tax incentives, regulatory review, and public education programs, the DHPO works with local governments, private property owners, nonprofit organizations, and federal agencies to preserve the architectural, archaeological, and cultural resources that document Delaware's history.

History

Delaware's formal commitment to historic preservation developed alongside the broader national movement that emerged after World War II, as rapid suburbanization and urban renewal projects threatened historic buildings and landscapes across the country. The state's early preservation efforts were largely ad hoc, driven by civic organizations and historical societies rather than a coordinated government program. That changed in 1966. The passage of the National Historic Preservation Act that year created the framework for a nationwide network of State Historic Preservation Offices (SHPOs), and Delaware moved to establish its own office in compliance with the federal mandate.[3] The act required each participating state to survey historic properties, maintain a statewide inventory, nominate eligible properties to the National Register, and review the effects of federally assisted projects on historic resources. It's worth noting that earlier dates sometimes cited for the DHPO's founding, including references to a 1957 enabling act, have not been confirmed by the agency's own documentation and should be treated with caution until primary sources verify them.

The National Historic Preservation Act also established the Section 106 review process, which requires federal agencies to consult with SHPOs before approving projects that might affect properties listed on or eligible for the National Register. This function became one of the DHPO's most consequential roles. Thousands of federal undertakings, from highway construction to telecommunications projects, require DHPO review annually, giving the office significant influence over land use and development decisions throughout Delaware.[4]

In the decades following the office's establishment, its scope expanded considerably. The 1970s and 1980s brought growing recognition that historic preservation needed to account for underrepresented communities whose heritage had been largely absent from earlier designation efforts. The DHPO began actively working to identify and document African American historic sites in Wilmington and elsewhere in the state, as well as the landscapes associated with Indigenous peoples and immigrant communities. A parallel expansion occurred in the archaeological program, as the office developed standards for archaeological surveys required under Section 106 and for state-funded projects.

The office also played a central role in documenting Delaware's industrial heritage. Working with institutions like the Hagley Museum and Library, the DHPO helped preserve the legacy of the DuPont Company's early manufacturing operations along the Brandywine Creek, including powder mills and worker housing that represent some of the earliest large-scale industrial complexes in North America.[5] Today the office continues to adapt its programs, addressing emerging challenges including the effects of climate change on historic properties and the need to integrate digital survey tools into its statewide inventory work.

Administration and Legal Authority

The DHPO operates within the Delaware Division of Historical and Cultural Affairs, which sits under the Delaware Department of State rather than the Department of Natural Resources and Environmental Control. This distinction matters practically: state historic sites and museums in Delaware are managed by the Division of Historical and Cultural Affairs, while natural resource lands are managed separately by DNREC. The DHPO serves as Delaware's State Historic Preservation Officer program, the point of contact between state government and the federal historic preservation system administered by the National Park Service.[6]

Delaware Code Title 7, Chapter 53 gives the DHPO authority to designate historic properties under state law, regulate alterations to state-designated landmarks, and administer grant programs funded through the federal Historic Preservation Fund. The office also coordinates with the Advisory Council on Historic Preservation in Washington when Section 106 reviews involve particularly complex or controversial undertakings. Locally, the DHPO works alongside municipal historic district commissions in cities like Wilmington and Dover, providing technical guidance on design standards and preservation best practices.

National Register of Historic Places

Delaware has a substantial number of properties listed on the National Register of Historic Places, spanning individual buildings, historic districts, archaeological sites, and cultural landscapes. The DHPO manages the nomination process for Delaware properties, evaluating whether sites meet the National Register's criteria for significance in history, architecture, archaeology, engineering, or culture, and whether they retain sufficient physical integrity to convey that significance.[7] Nominations are reviewed first by the Delaware State Review Board for Historic Preservation before being forwarded to the National Park Service for final listing.

Listed properties in Delaware range from the New Castle Historic District, which preserves one of the most intact colonial-era town centers on the East Coast, to 19th-century farmsteads in Sussex County, 18th-century churches, and the industrial complexes of the Brandywine Valley. The Winterthur Museum, Garden and Library and the Hagley Museum and Library are both National Historic Landmarks, the highest designation within the National Register system, reflecting their exceptional national significance.[8]

Listing on the National Register does not restrict what private property owners can do with their own property. It does, however, make them eligible for federal historic preservation tax credits, which provide a 20 percent income tax credit for the certified rehabilitation of income-producing historic buildings. The DHPO administers the certification process for these credits in Delaware, reviewing proposed rehabilitation plans to ensure they meet the Secretary of the Interior's Standards for Rehabilitation.[9]

Section 106 Review

One of the DHPO's most active functions is administering the Section 106 review process under the National Historic Preservation Act. Section 106 requires federal agencies to consider the effects of their undertakings on historic properties before approving permits, issuing licenses, or disbursing federal funds. In practice, this means that virtually any project receiving federal money or requiring a federal permit, from road expansions and utility installations to telecommunications tower construction and federally funded housing rehabilitation, must be reviewed by the DHPO if historic properties might be affected.[10]

The review process begins with identification: federal agencies, often working with project applicants, must identify historic properties in the project's area of potential effect. The DHPO then assesses whether the project will have an adverse effect on those properties. If it will, the agency, applicant, DHPO, and other consulting parties negotiate a Memorandum of Agreement outlining mitigation measures, which might include archaeological excavation before ground disturbance, facade preservation, or documentation of buildings that can't be saved. Not every review results in conflict. Many Section 106 consultations conclude quickly when projects are designed to avoid historic resources or when no significant properties are present.

The Section 106 process has shaped major infrastructure decisions in Delaware. Highway realignments, bridge replacements, and redevelopment projects in historic downtown areas have all been modified through Section 106 consultation to reduce impacts on listed properties and historic districts. This regulatory role gives the DHPO influence well beyond its grant-making activities.

Geography

Delaware's compact size belies significant geographic diversity, and the DHPO's preservation work reflects that variety. The northern part of the state, anchored by Wilmington and New Castle County, contains the highest concentration of urban historic resources: Federal-period row houses, Victorian commercial blocks, 20th-century industrial buildings, and the colonial streetscapes of New Castle itself. The Brandywine Valley, straddling the Pennsylvania border, contains a particularly rich concentration of 18th- and 19th-century country houses, mills, and designed landscapes, including the estates now occupied by Winterthur Museum, Garden and Library and other institutions.[11]

Central Delaware, dominated by Kent County and the capital city of Dover, preserves a different character: a mid-Atlantic agricultural landscape punctuated by 18th-century courthouse towns, plantation-era farmsteads, and the historic core of Dover itself, where the Old State House and Legislative Hall anchor a district that has been central to Delaware governance since the colonial period. Southern Delaware, comprising Sussex County, contains the state's greatest concentration of rural historic resources, including 19th-century farmsteads, small crossroads towns, African American churches and schools from the post-Civil War era, and the maritime communities along the Delaware Bay and Atlantic Coast.

The DHPO uses geographic information systems (GIS) to maintain and analyze its statewide inventory of historic properties, allowing staff to identify survey gaps, plan targeted fieldwork, and provide data to local governments and federal agencies conducting Section 106 reviews. Coastal areas present particular challenges. Rising sea levels and increasing storm intensity threaten historic resources in communities like Lewes and along the Delaware Bay shoreline, and the DHPO has been working to integrate climate vulnerability assessments into its survey and planning work.

Climate Change and Historic Properties

Climate change poses a direct and growing threat to Delaware's historic resources, particularly in the coastal and low-lying areas that contain some of the state's most significant properties. Delaware is among the most vulnerable states on the East Coast to sea level rise, with projections from the National Oceanic and Atmospheric Administration indicating continued increases in tidal flooding frequency throughout the century.[12] Historic structures built in the 18th and 19th centuries were not designed with these conditions in mind, and repeated flooding causes cumulative damage to foundations, masonry, and wood framing that standard maintenance programs can't easily address.

The accuracy of existing flood zone designations is a legitimate concern. Federal Emergency Management Agency flood maps, which designate 100-year and 500-year flood zones, are updated periodically but often lag behind observed changes in flooding patterns caused by climate change and local development. Property owners in areas formally designated as low-risk have in some cases experienced repeated flooding events, raising questions about whether current maps adequately reflect actual risk to structures in those areas.[13] For historic properties, this gap between official designation and experienced reality is particularly consequential: flood insurance decisions, grant eligibility, and local ordinance requirements are all tied to FEMA flood zone status.

The DHPO has begun incorporating climate resilience considerations into its technical guidance for historic property owners and into its survey prioritization. Preserving a building's historic character while improving its resilience to flooding is a challenge, since flood mitigation measures like elevating structures, installing flood barriers, or waterproofing masonry can conflict with the Secretary of the Interior's Standards for Rehabilitation that govern federally assisted preservation work. The office works with property owners and the National Park Service to identify approaches that protect historic integrity while reducing vulnerability. Still, the pace of adaptation in government programs has generally been reactive, responding to damage after major storms rather than systematically addressing risk before it materializes.

African American Heritage

Delaware's African American heritage represents one of the DHPO's most important and historically underserved areas of preservation work. The state's history encompasses the full arc of the African American experience from enslavement through emancipation, the Great Migration, and the Civil Rights Movement, and significant physical resources associated with that history survive across all three counties.

In Wilmington, the DHPO has worked to identify and document historic African American neighborhoods, churches, and institutions, including resources associated with the city's role as a destination for African American migrants from the South during the early 20th century. Wilmington's African American community sustained a network of churches, fraternal organizations, and businesses that are documented in the statewide historic property inventory, though the level of formal National Register designation for these resources continues to lag behind their historical significance. That gap has been a focus of targeted survey work in recent years.

Rural Sussex County contains a particularly significant concentration of African American heritage resources, including the Colored School buildings constructed under the Julius Rosenwald Fund program in the early 20th century and the small rural churches that served as community anchors during the era of legal segregation. The DHPO has supported survey and nomination work focused on these resources, recognizing that their significance extends beyond Delaware to the broader national narrative of African American education and community institution-building.

Economy

Historic preservation generates measurable economic activity in Delaware, both through direct tourism spending and through the private investment stimulated by preservation tax incentives. The federal Historic Tax Credit program, administered in part through the DHPO's certification process, has financed the rehabilitation of historic commercial and industrial buildings in Wilmington and other Delaware cities, converting underused structures into housing, office space, and retail uses that contribute to local tax bases.[14] Studies of the federal tax credit program nationally have consistently found that rehabilitation of historic buildings generates more construction jobs per dollar invested than new construction, because rehabilitation is more labor-intensive and relies less on prefabricated materials.[15]

Tourism tied to historic sites is a significant component of Delaware's visitor economy. The First State Heritage Park in Dover, a partnership among state agencies and nonprofit organizations that connects historic sites across the capital city, draws visitors to the Old State House, the historic Green, and other downtown landmarks. The Brandywine Valley's concentration of museums, gardens, and historic sites, including Winterthur and Hagley, attracts regional visitors who generate spending in hotels, restaurants, and retail. Cape Henlopen and the historic town of Lewes together form another visitor draw on the Atlantic Coast, combining natural heritage with a colonial-era townscape that the DHPO has helped protect through survey, designation, and technical assistance to local historic district boards.

Property values in designated historic districts in Delaware generally perform competitively with comparable non-designated areas, a pattern documented in studies of historic district economics nationally.[16] The effect is most visible in neighborhoods like the New Castle Historic District and portions of downtown Dover, where designation has helped stabilize property values and attract reinvestment.

Attractions

The DHPO supports and promotes a range of historic sites and attractions across Delaware, though it's the Division of Historical and Cultural Affairs that directly manages many of the state-owned historic sites and museums. Among the most visited is the Hagley Museum and Library, a National Historic Landmark occupying the site of E.I. du Pont's original black powder mills along the Brandywine Creek. The museum's collection documents the history of American industry and technology, and its restored mill buildings, workers' community, and Georgian-style residence offer visitors a detailed picture of early American industrial enterprise.<ref>[https://www.hagley.org/about "About

  1. ↑ "Delaware Division of Historical and Cultural Affairs", history.delaware.gov.
  2. ↑ "Delaware Code Title 7, Chapter 53: Historic Preservation", Delaware General Assembly.
  3. ↑ "National Historic Preservation Act", National Park Service.
  4. ↑ "Introduction to Section 106", Advisory Council on Historic Preservation.
  5. ↑ "Collections and Research", Hagley Museum and Library.
  6. ↑ "State Historic Preservation Offices", National Park Service.
  7. ↑ "How to Nominate a Property", National Park Service, National Register of Historic Places.
  8. ↑ "National Historic Landmarks Program", National Park Service.
  9. ↑ "Federal Historic Preservation Tax Incentives", National Park Service.
  10. ↑ "Section 106 of the National Historic Preservation Act", Advisory Council on Historic Preservation.
  11. ↑ "About Winterthur", Winterthur Museum, Garden and Library.
  12. ↑ "Technical Report on Sea Level Rise", NOAA.
  13. ↑ "National Flood Hazard Layer", Federal Emergency Management Agency.
  14. ↑ "Federal Historic Preservation Tax Incentives", National Park Service.
  15. ↑ "Economic Benefits of Historic Preservation", National Trust for Historic Preservation.
  16. ↑ "Economics of Historic Districts", National Trust for Historic Preservation.
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