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Open all year; 9:00 a.m. to sunset daily unless otherwise signed at gate. Fee charged.

The oldest blockhouse in the United States is all that remains of Fort Halifax at the confluence of the Kennebec and Sebasticook Rivers in Winslow, Maine. English settlers built the fort in 1754 to protect colonial settlements along the Kennebec and it served as a garrison for troops from 1754-1766.

On April 1, 1987, flood waters swirled eight feet high around the structure and dismantled it completely. Crews in boats recovered the log timbers scattered for many miles downriver and the blockhouse was reassembled the following year. Today, the fort bears the designation as a National Historic Landmark.

To learn more about Fort Halifax, click here.

View detailed plans of the fort from the Historic American Building Survey here.

For a guided tour of the region's geologic highlights, see The Geology of Cobscook Bay State Park Learn about the geology of the area on the interactive Maine Geologic Facts and Localities map.

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Winslow, Maine

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Fort Halifax State Historic Site
c/o Bureau of Parks and Lands
106 Hogan Road
Bangor, ME 04401

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One mile south of the Winslow-Waterville bridge on U.S. Route 201