The Minisink Valley Historical Society seeks to preserve and share the history of the Minisink Valley which stretches across New Jersey, New York, and Pennsylvania. To this end, the society operates the Fort Decker Museum of History. The structure was originally built in 1760 as a defensive center against Native American attack and as a trading post.

The society offers archival access, exhibits, and 50-minute outreach slide presentations. Appointments are required for archival access. Slide presentation topics include author Stephen Crane, the Delaware and Hudson Canal, artist John Newton Howitt, cemetery history, Theodore Roosevelt, Franklin D. Roosevelt, Eleanor Roosevelt, and the bluestone industry. The website offers a small collection of music and historical photographs.