Bannerman's Island Arsenal
Why it's listed
Bannerman's Island, also called Pollepel's Island, sits in the Hudson River about half a mile north of the Breakneck tunnel, in the Town of Fishkill. Francis Bannerman VI bought it in 1900 to store surplus munitions and artillery he had acquired after the Civil and Spanish-American Wars. Between 1901 and 1910 he designed and built a superintendent's house, storehouses, a workshop, a castle patterned after an old Scottish castle, and a breakwater with towers and turrets. He died in 1918 with the castle unfinished. The island was cleared of war materials in 1959, and a fire in 1969 left only portions of the castle walls and a collapsed caretaker's lodge. The site is recognized for its architecture, its link to Bannerman, and its earlier role as a navigational landmark. During the Revolution, a chain of iron-spiked obstructions extended from the island to the western shore to block British ships. Archaeological evidence may remain, though further testing is needed.
Significance in brief: The nomination cites the island's architecture, its association with Francis Bannerman VI, a major figure in the American munitions trade, and its role as a navigational and strategic landmark in the Hudson Highlands. It also notes the island's Revolutionary War role as the origin point of a chevaux de frise barrier across the river.
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 82001121, listed November 23, 1982. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence medium).
Key facts
| Address | Pollepel Island, off NY 9-D, Fishkill |
|---|---|
| County | Dutchess County |
| Listed | November 23, 1982 |
| Reference number | 82001121 |
| Resource type | Building |
| Architect / builder | Francis Bannerman VI (architect); builder unknown |
| Areas of significance | Architecture, Maritime History |
| Level of significance | Local |
| Status (as stated in the nomination) | Vacant and deteriorated; a 1969 fire destroyed the buildings, leaving only a few castle walls and the collapsed caretaker's residence. Owned by the Taconic State Park Commission. |
| Acreage | 13.4 |
| Coordinates | 41.45519, -73.98804 (NPS GIS) |
What listing means for this property
National Register listing is honorary: it recognises significance and does not restrict what a private owner may do without federal money or permits. It unlocks the 20% federal rehabilitation tax credit for income-producing buildings, state credits in many states, and Section 106 review when federal agencies are involved. See what listing means in practice.
Noted as vacant in the nomination. Nomination documents can be decades old; current status may differ. If you are considering buying an empty listed property, read the due-diligence checklist.
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 82001121.
- Nomination form (PDF, National Archives) — catalog entry
- Wikidata Q89672220
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.