Constructed in 1759, the Fort Brewerton historic site was built to protect the passage from Albany to the port of Oswego. The fort originally was in the form of an eight-pointed star and surrounded by a 10-foot moat. The fort also had a 480-foot parapet and housed four log blockhouses used. for munitions and supplies, and wells.
 

The Oliver Stevens Blockhouse is a log reconstruction of a late 18th-century log block house that was once located on the site and served as a trading post and home of Oliver Stevens and his family, one of the first settlers of the area. Built of logs, the blockhouse is based on the original design of the building, built with actual bricks recovered from the rubble which Steven had himself taken from the ruined fort.
 

Currently, the Blockhouse serves as headquarters for the Fort Brewerton Historical Society as well as a museum that is home to 10,000 years of local history, including Native American materials, military artifacts, and 18^th-century life.

 
The Blockhouse Museum is currently open on the third Saturday of each month, April through December.