County Bridge No. 148
Why it's listed
Single-span stone arch bridge carrying Street Road over a branch of Chester Creek in Westtown and Thornbury townships, Chester County, Pennsylvania. Completed in 1911 by the local contractors P.J. McCormick & Sons, who set a bridge plaque into the inner parapet. The structure has a 36-foot main span within a total length of 150 feet and a width of about 25 feet. Its coursed, roughly square stone is laid in a camelback configuration, with dark stone used for the parapet coping stones that emphasize the profile. The bridge is regarded as a typical small-span bridge of its period, built in the manner of nineteenth-century Pennsylvania highway bridges. Its significance rests on its engineering: the design quality and the preservation of its original character. It carries vehicular traffic today, as it did originally. The bridge is one of a group of Commonwealth-owned highway bridges included in a multiple resource nomination.
Significance in brief: The nomination describes the bridge as a typical small-span twentieth-century stone arch bridge built in the style of Pennsylvania's nineteenth-century highway bridges, and states that it is notable for its high-quality design and integrity. Its engineering interest lies in its camelback configuration, with coursed, roughly square stone and dark parapet coping that accentuates the shape. The listing area of significance is engineering.
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 88000879, listed June 22, 1988. Summary generated October 2026 (model claude-haiku-5-5, prompt v1.1-2026-10-29, confidence low).
Key facts
| Address | PA 926 over Chester County, Westtown |
|---|---|
| County | Chester County |
| Listed | June 22, 1988 |
| Reference number | 88000879 |
| Resource type | Structure |
| Period of significance | 1911 |
| Architect / builder | P.J. McCormick & Sons (builder/contractor) |
| Architectural style | Camelback stone arch bridge |
| Areas of significance | Engineering |
| Level of significance | State |
| Status (as stated in the nomination) | Use is vehicular, both present and original. |
| Acreage | 0.9 |
| Coordinates | 39.93170, -75.55122 (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 88000879.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q5177630
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.