Harmon's Covered Bridge
Why it's listed
Harmon's Covered Bridge is a wooden Town truss bridge carrying road T488 across Plum Creek in Washington Township, Indiana County, Pennsylvania. Built in 1910, it has an end-post length of 41 feet and sits within the Ohio River watershed, where Plum Creek feeds into the larger drainage. Its design shares the common features of the county's covered bridges: vertical siding, a gable roof, and an open window area at the roofline. The floor is laid with boards running across the span. The bridge is one of four covered bridges still standing in Indiana County, where six were once in place. It is significant as an intact example of 19th-century wood bridge construction and transportation engineering. The county owns the bridge and maintains it well. Its recorded weight limit is three tons. It was listed as part of a thematic group of the county's surviving covered bridges.
Significance in brief: The nomination argues the bridge is significant as one of the four surviving covered bridges in Indiana County, which once had six. It is presented as an intact and important example of 19th-century wood bridge technology and transportation structures, as part of a thematic group of covered bridges.
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 79002242, listed August 3, 1979. Summary generated October 2026 (model claude-haiku-5-5, prompt v1.1-2026-10-29, confidence medium).
Key facts
| Address | NE of Willet, Willet |
|---|---|
| County | Indiana County |
| Listed | August 3, 1979 |
| Reference number | 79002242 |
| Resource type | Structure |
| Areas of significance | Engineering, Transportation |
| Level of significance | Local |
| Status (as stated in the nomination) | Owned by the County and well maintained, per the description; posted weight limit of 3 tons appears on the bridge plate. |
| Acreage | 0.1 |
| Coordinates | 40.71354, -79.08119 (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 79002242.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q5659133
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.