Otter Brook State Park offers a boat ramp for water access on Otter Brook Lake in Keene, with a U. S. Army Corps of Engineers day-use facility featuring picnic areas, grills, and three reservable shelters.

As of 2025, the recreation area operates walk-in only with the entrance gate closed, no restroom facilities, and no shelter reservations available, though visitors can still enjoy hiking, biking, picnicking, and disc golf.

The swimming beach is permanently closed and water-based activities are at visitors' own risk.