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Fort Knox State Historic Site

Fort Knox Road, Prospect, ME 04981, USA

Fort Knox, built to protect the Penobscot River Valley from attack, is a massive third-system defensive structure overlooking the Penobscot River that was used as a garrison for Union troops during the Civil War. The Penobscot Narrows Bridge and Observatory features a 420-foot tall observation tour overlooking the river, the only one of its kind in the western hemisphere.


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Google Satellite Map of Prospect, ME.

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From Belfast: Proceed north on US Rte 1, through Searsport and Stockton Springs, immediately before crossing the Penobscot Narrows Bridge, take a left onto Rte. 174. Fort Knox will be approximately 1/4 mile up on your right. From Bar Harbor: Follow US Rte. 1 south across the Penobscot Narrows bridge, immediately adjacent to the town of Bucksport. Once over the bridge take a right onto Rte. 174. Fort Knox will be approximately 1/4 mile up on your right.

Visitor Services

Public rest rooms, information, handicapped access, gift shop, museum, trails.

Regular Events

Summer: interprative tours; call or check Web site for events.

Plan Your Visit

Admission Fee

Adult resident $3.00, adult non-resident $4.50, children (5-11) $1.00, children 4 & under and resident seniors free, non-resident seniors $1.50


Fort Knox: May - October: 9:00AM - sunset; Penobscot Narrows Observatory: May - June, Sept - October: 9:00AM - 5:00PM, July - August: 9:00AM - 6:00PM


207-469-7719 / 207-469-6553

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