Accessible only by boat, the state park has four areas for primitive, riverside camping.

It is located on the east side of the Connecticut River south of Gillette Castle State Park, and is separated from the mainland by Selden Creek, land owned by the Nature Conservancy.

It is primarily wooded except for a fringe of tidal marshes, and has a high point of 230 feet (70 m).

Excavations on the island in the 1980s uncovered a sizable Middle Woodland Period village, with radiocarbon dates to c. 1000 CE.

Stone tools, pottery fragments, and animal bones are among the many artifacts found in the excavation, which only covered an estimated 2% of the site,[5] which was listed on the National Register of Historic Places in 1987.