Watertown Arsenal Historic District
Also known as: Army Materials Technology Laboratory
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Why it's listed
Occupying 45 acres along Arsenal Street in Watertown, this district is the surviving core of the Watertown Arsenal, an Army ordnance depot founded in 1816 and later home to the Army Materials Technology Laboratory. Its red brick buildings, with spare classically inspired designs from different periods, include 15 contributing buildings, three structures, a site and an object. A cluster of four long gable-roofed buildings formed the gun carriage manufacturing complex, dating from 1851 to 1894. Research laboratories occupy the western part, including a converted 1922 piano factory. Near the entrance drive, the Italianate Commanding Officer's Quarters and the Colonial Revival Administration Building sit within a landscape designed by the Olmsted firm. The district is surrounded by brick posts and wrought iron fencing. Land to the east, once part of the arsenal, was turned over to the town in 1968 and is outside the district. Contributing resources relate to the Arsenal's activities between 1816 and 1947, which marks its period of significance.
Significance in brief: The district preserves a group of buildings, structures and landscape features that were integral to the Watertown Arsenal's work from 1816 to 1947. Its gun carriage manufacturing complex illustrates changes in industrial design in the second half of the nineteenth century. Its differentiated zones for industry, research, administration and housing are linked by shared roads, architecture and landscaping.
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 99000498, listed May 14, 1999. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence medium).
Key facts
| Address | Arsenal St., Watertown |
|---|---|
| County | Middlesex County |
| Listed | May 14, 1999 |
| Reference number | 99000498 |
| Resource type | District |
| Period of significance | 1816-1947 |
| Architect / builder | Monks & Johnson (Boston architectural and engineering firm, for 1917 changes to Building 43); Olmsted firm (landscape) |
| Architectural style | Mid 19th Century; Late Victorian; Early 20th Century Industrial, No Style |
| Areas of significance | Architecture, Engineering, Industry, Invention, Landscape Architecture, Military |
| Level of significance | National |
| Status (as stated in the nomination) | Current functions listed as defense military facility and vacant/not in use; the text also says the northeast area continues to be used by the General Services Administration and the Reactor (Building 100) was demolished in 1993. |
| Acreage | 45 |
| Coordinates | 42.36176, -71.16455 (NPS GIS) |
What listing means for this property
This is a historic district. Buildings within its boundary are either contributing (they add to the district's significance) or non-contributing. Owners of contributing income-producing buildings can claim the 20% federal rehabilitation tax credit; homeowners should look at state credits. National Register districts impose no design review by themselves; a local historic district ordinance, if one exists, does (the difference explained).
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 99000498.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q2864383
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.