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Mill Road Bridge

Mill Road Bridge

Primary Photographer(s): Elaine Deutsch

Bridge Documented: 2008

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Facility Carried / Feature Intersected
Mill Road (TR-540) Over Valley Creek
Location
Rural: Chester County, Pennsylvania: United States
Construction Date and Builder / Engineer
1882 By Builder/Contractor: John Denithorne and Sons of Phoenixville, Pennsylvania
Rehabilitation Date
Not Available or Not Applicable
Main Span Length
36.0 Feet (11 Meters)
Structure Length
37.0 Feet (11.3 Meters)
Roadway Width
13 Feet (3.96 Meters)
Spans
1 Main Span(s)
Inventory Number
15701505400167

Historic Significance Rating (HSR)
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Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This pony truss is one of a number of bridges in Chester County built by John Denithorne and Sons (at the time this bridge was built, the firm was known as Denithorne Brothers). This small pony truss bridge is noted for its unusual threaded rod with nut connection detail where the diagonal member meets the top chord  and end post. This detail is extremely similar to that used by the Wrought Iron Bridge Company of Canton Ohio. This bridge demonstrates that the Wrought Iron Bridge Company was clearly not the only company to use this detail on its pony truss bridges.

Information and Findings From Pennsylvania's Historic Bridge Inventory

Discussion of Bridge

The one-span, 37'-long, wrought-iron, pony truss bridge built in 1882 is supported on stone abutments. The bridge has built-up upper chords and verticals, and eye bar lower chords and diagonals. Cast-iron connecting pieces are used at the end post-upper chord connections, but all other connections are pinned. U-shaped hangers support built-up fishbelly floorbeams. Channel railings (ca. 1950) are welded to the inside of the truss lines. U-shaped stone wingwalls with parapets enclose the approach roadways. The wingwalls have been repaired and buttressed by concrete walls faced with stone (1997). The bridge is an early and complete example of its type and design with uncommon cast-iron connecting piece details. These type of cast-iron connections were used during a period of transition from the all cast- and wrought-iron truss bridges of the mid-19th century, to the all pinconnected truss bridges of the late 1880s and 1890s. Surviving examples with the cast-iron connecting pieces are rare. The bridge was built by Denithorne Brothers, a leading fabricator of metal truss highway bridges in the county and region. It is the oldest of ten identified Denithorne-built bridges in Chester County from 1882 to 1905.

Discussion of Surrounding Area

The bridge carries a one lane road over a stream in a small area of open space surrounded by late-20th-century suburban commercial and residential development north of the US 202 corridor. South of the bridge is a wooded township-owned open space with hiking trails. At the bridge's northwest quadrant is the David Harvard House (NR-listed 10/26/1972), a late- 18th-century vernacular stone residence.

Bridge Considered Historic By Survey: Yes

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Maps and Links: Mill Road Bridge

Coordinates (Latitude, Longitude):

Search For Additional Bridge Listings:

Bridgehunter.com: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

Bridgehunter.com: View listed bridges within 10 miles (16 kilometers) of this bridge.

HistoricBridges.org Bridge Browser: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

HistoricBridges.org Bridge Browser: View listed bridges within 10 miles (16 kilometers) of this bridge.

2021 National Bridge Inventory: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

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