Willow Mill Complex
Also known as: Shaw-Leedom House and Mill; Sager, Howard, House and Mill
Why it's listed
Willow Mill is a group of stone buildings on Bustleton Pike in Northampton Township, Bucks County, split by the road. The Shaw-Leedom house, built about 1800 in the Federal style, sits on a rise above Iron Works Creek with a spring house nearby. Across the road stand the Sager house, dated 1847 by an inscribed lintel, the wagon house and a four-story stone grist mill rebuilt in the 1840s on the site of a mill first established about 1739 by John and Joseph Shaw. The mill ran continuously as a milling business for well over a century, producing flour, flax oil and sawn lumber. The complex is significant for its ties to the grain milling economy of Bucks County and for its vernacular stone architecture, including the Sager house keystone lintels and the Dutch Stoop kitchen wing. Its original setting and buildings remain largely intact.
Significance in brief: The complex is argued to be significant under Criterion A for its association with grain milling in Northampton Township and Bucks County in the late eighteenth and nineteenth centuries, and under Criterion C for its stone vernacular Federal-style architecture and its intact mill and house group. The nomination treats the Sager house, with its keystone-and-stone-lintel window arrangement and Dutch Stoop wing, as a distinctive local example of the work of builder Cornelius McKinney. It also notes that the complex is well preserved compared with the other surviving mills in the township.
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 02000476, listed May 9, 2002. Summary generated October 2026 (model claude-haiku-5-5, prompt v1.1-2026-10-29, confidence high).
Key facts
| Address | 570, 559, and 569 Bustleton Pike, Richboro |
|---|---|
| County | Bucks County |
| Listed | May 9, 2002 |
| Reference number | 02000476 |
| Resource type | Building |
| Period of significance | C. 1740-1905 |
| Architect / builder | Shaw, Joseph (mill founder, 1739 mill); McKinney, Cornelius (builder, Sager house) |
| Architectural style | Federal |
| Criteria |
|
| Areas of significance | Industry, Architecture |
| Level of significance | Local |
| Status (as stated in the nomination) | Mill converted to residential use in 1938 and used for mushroom growing and as a residence in the twentieth century; Shaw-Leedom and Sager houses remained residential. |
| Acreage | 11.6 |
| Coordinates | 40.19934, -75.01030 (NPS GIS) |
What listing means for this property
For an income-producing building, listing (individually or as a contributing building in a district) is the gateway to the 20% federal rehabilitation tax credit on qualified rehabilitation costs, often stackable with state credits. Work claiming the credit must follow the Secretary of the Interior's Standards and be approved in advance.
Listing does not restrict a private owner acting without federal money or permits; where federal funding or licensing is involved, Section 106 review applies.
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 02000476.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q8022335
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.