Overview

The Cool Spring Park Historic District is a well-preserved late-19th and early-20th century residential neighborhood in western Wilmington, Delaware. Centered on the city’s historic Cool Spring Park and Reservoir, the district captures the story of Wilmington’s suburban expansion, public infrastructure improvements, and the architectural tastes of its rising middle and upper-middle classes.

Original Listing

1983 (approximately 11 city blocks)

Boundary Increase

2007 (adds roughly 42 acres / 9 blocks)

Period of Significance

1873 – 1940

Contributing Resources (2007 increase)

81 buildings + 3 structures + 3 objects

Non-contributing Buildings

36 (primarily recent townhouse clusters)

Individually Listed NR Properties

4 (including Rodney Court, Postles’ House, New Century Club)

Historical Development & Significance

The district is eligible for the National Register under Criteria A (significant events in community planning, public works, and transportation) and Criteria C (distinctive architectural characteristics of late Victorian through early 20th-century revival styles).

Social & Economic Context: Wilmington author Henry Seidel Canby distinguished the city’s “plain people” (shopkeepers and solid middle-class citizens without inherited attitude) from the upper class he called “Us.” The original district largely housed the former; the western addition attracted more vice-presidents, philanthropists, and civic leaders. The broader economic transformation of Wilmington from heavy industry into the chemical capital of the world (DuPont, Atlas, Hercules) is reflected in the district’s development.

Location, Boundaries & Geography

The district occupies one of the highest elevations in Wilmington. The original district reaches approximately 125 feet above sea level; the boundary-increase area ranges from 160–190 feet, offering views over much of the city and, from upper floors of some houses, toward the Delaware River.

Original District (1983 Nomination)

Approximately eleven square city blocks in the western section of Wilmington. The district slopes uphill in a westerly direction from the west side of I-95. It is bounded generally by Park Place and Jackson Street on the east, Delaware Avenue vicinity on the north, 7th Street on the south, and Harrison Street on the west. Cool Spring Park (7.5 acres) forms the visual and recreational focal point.

2007 Boundary Increase

Contiguous area generally west of properties fronting Rodney Street, irregularly between 9th/10th Streets and Pennsylvania Avenue. The increase adds nine city blocks and the major contributing structure of the Cool Spring Reservoir (approximately six acres). This area was already included in Wilmington’s local Cool Spring/Tilton Park City Historic District overlay zoning.

Architectural Character

Original District

The street layout is a grid pattern extending the earlier downtown street system. Houses generally have consistent setbacks from the street and small front lawns or gardens. Many sidewalks were originally brick; a few sections remain thanks to community preservation efforts. Building materials are predominantly brick, with stone foundations or trim, wood porches (many later altered), and slate or patterned-tin roofs.

Primary Architectural Styles: Queen Anne, Second Empire (mansard roofs), Stick Style, and some Italianate and eclectic High Victorian Gothic interpretations by local builders.

Recurring features include bay windows (often full-height or three-window bays), varied dormers (hipped, gabled, gambrel, pedimented), bracketed cornices, decorative terra-cotta keystones and belt courses, occasional towers or turrets, and one-story front porches. An early 1907 postcard shows the park with cloverleaf-shaped ponds, curving footpaths, and many species of trees — water has always been a defining feature of the district.

Boundary Increase Area

This area is distinguished by lower density, larger lots (typically between one-tenth and one-third of an acre), and more detached or semi-detached houses. Development here occurred slightly later and coincided with increasing automobile ownership, resulting in early garages and outbuildings for substantial landscaping. Architectural emphasis shifts toward early-twentieth-century revival styles:

Primary Styles in the Increase: Colonial Revival, Tudor Revival, Classical Revival, and Italian Renaissance Revival.

Wider house forms enabled more elaborate, often symmetrical compositions featuring Palladian windows, fanlights, pedimented dormers, and classical columns. Brick remains the dominant material, with some stone, cast stone, and stucco appearing on higher-style examples.

Key Landmarks & Non-Residential Resources

Original District

• Cool Spring Park (7.5 acres) — The focal point of the district. Features a spray slab with a statue of a child by Charles Parks, curving concrete paths, benches, and play equipment. Renovated in 1972. One of Wilmington’s oldest parks.
• Cool Spring Pumping Station (northwest corner of 10th and Harrison Streets, 1870s) — One-and-a-half story brick building with octagonal cupola and terra-cotta acanthus-leaf keystones over the openings. Originally part of the reservoir development; briefly served as a museum of natural history before returning to pumping station use. Most windows are now filled with concrete, but the exterior remains largely intact.
• Knights of Pythias Hall (1106 West 10th Street) — Stone Colonial Revival building originally constructed as the Orthodox Friends Meeting. Features a classical entry porch with pediment supported on paired wooden columns and 9-over-9 double-hung sash windows.
• Cool Spring Elementary School — Modern school building occupying the northern half of one block. The only major modern intrusion into the original district and the only building not original to its site.

Boundary Increase Area

• Cool Spring Reservoir — Major contributing structure occupying approximately six acres. The embankment and water body are imposing landscape features. City walkways around the reservoir create popular passive recreation paths.
• Padua Academy and Ursuline Academy — Multiple historic and purpose-built buildings that contribute significantly to the institutional vitality of the area. Includes a 1905 Neoclassical former First Church of Christ Scientist building at 1201 North Van Buren Street (now used by Ursuline) and a Tudor Revival former Tallman house used as a convent.
• Church of the Holy City (Swedenborgian) — Gothic Revival church at the corner of North Broom Street and Pennsylvania Avenue.
• New Century Club (1014 Delaware Avenue) — Colonial Revival building now serving as the Delaware Children’s Theater. Individually listed on the National Register.
• Ingleside Corporation — Senior care facility that manages the former Brown mansion at 1010 North Broom Street and includes a modern high-rise component on the eastern side of the property.

The 2007 Boundary Increase

The boundary increase was nominated under the same National Register criteria as the original district. It captures the continuation of the same historic development pattern — stimulated by the reservoir, park, and improved transportation — but at a slightly later date and lower density. The added area already formed part of Wilmington’s local historic overlay zoning district.

While the original district is characterized by higher-density attached and semi-detached houses built primarily for the middle class, the increase area features larger lots, more detached homes, early garages, and a greater concentration of institutional and religious buildings. There is a clear social and economic gradient that rises with the topography: more prominent businessmen, philanthropists, and civic leaders resided in the western section.

The increase retains strong historic integrity. Although 36 non-contributing buildings were added (primarily clusters of modern townhouses), their collective footprint is relatively small. No contributing buildings were constructed in the amendment area after 1940. The overall district continues to convey its historic associations with Wilmington’s urbanization, sanitary reforms, transportation improvements, and architectural evolution from the late nineteenth through the early twentieth century.

Notable Residents & Figures

The original nomination contains granular information on late-19th-century occupants — railroad workers, artisans, merchants, a court stenographer, leather company principals, a druggist, and others — reflecting the solid middle-class character of the neighborhood at the time.

H. Fletcher Brown (1867–1944)

One of the most prominent residents of the expanded district. His Italian Renaissance Revival mansion at 1010 North Broom Street stands out stylistically within the predominantly Colonial Revival character of the western area. Brown received an A.B. in chemistry and an A.M. in physics from Harvard. He helped develop a new formula for smokeless powder while working at the Navy Torpedo Station in Newport, Rhode Island. He later rose to become a vice president, board member, and member of the executive committee at the DuPont Company.

Brown was a major philanthropist whose gifts supported the University of Delaware, the YMCA (including funding the Walnut Street YMCA for Wilmington’s African American community in 1940), the Historical Society of Delaware, the Boys & Girls Club of Delaware, the Delaware Art Museum, and the construction of the William C. Jason High School near Georgetown — the first segregated high school for African American students in Sussex County (completed 1950).