Bridge in Jefferson Borough
Why it's listed
A single-span stone arch bridge carries Cochran Mill Road over Lick Run in Jefferson Borough, Allegheny County. It was built in 1901 and measures about 30 feet overall, with a main arch span of 24 feet. The arch is formed of smooth cut stone, and the walls are of rock-face ashlar with smooth voussoirs and coping stones. Its designer and builder are not recorded. The bridge is regarded as a well-preserved example of a small early twentieth-century stone arch bridge. Although its modest span makes it technologically unremarkable, it shows the continuing use of stone arch construction in Pennsylvania. Its location is unusual, because most stone arch bridges in the related group are in the southeastern and south central parts of the state. Three sections of the stone parapet have fallen into the creek. The nominated area is limited to the bridge's superstructure and substructure, and the property is listed for its engineering significance.
Significance in brief: The nomination describes the bridge as a well-preserved representative example of a small early twentieth-century stone arch bridge, built with rock-face ashlar, smooth voussoirs and coping stones. It is presented as an example of the continuing stone arch tradition in Pennsylvania. Its location is described as unusual, since most stone arch bridges in the related thematic group are in the southeastern and south central parts of the state, and this one is said to be one of only five in western Pennsylvania.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 88000938, listed June 22, 1988. Summary generated October 2026 (model claude-haiku-5-5, prompt v1.1-2026-10-29, confidence medium).
Key facts
| Address | Cochran Mill Rd. over Lick Run, Cochrans Mill |
|---|---|
| County | Allegheny County |
| Listed | June 22, 1988 |
| Reference number | 88000938 |
| Resource type | Structure |
| Period of significance | 1901 |
| Architectural style | Stone arch bridge |
| Areas of significance | Engineering |
| Level of significance | State |
| Acreage | 0.9 |
| Coordinates | 40.29293, -79.97127 (NPS GIS) |
What listing means for this property
For a publicly owned building or structure, listing mainly matters when federal funds, permits or licences are involved: projects then go through Section 106 review so effects on the property are considered. Listing also strengthens applications for preservation grants and, for leased income-producing uses, can enable the federal rehabilitation tax credit.
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 88000938.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q4966361
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.