[3] Crooked Creek has one major impoundment, the Hammond Reservoir, formed by a dam just before it enters the Tioga River.

The lake has a surface area of 685 acres (2.77 km2) and is administered by the U.S. Army Corps of Engineers, who built the Hammond Dam from 1973 to 1979.

The dam projects were initially authorized by the United States Congress in the Flood Control Act of July 3, 1958 (Public Law 85-500).

However, in addition to flood control on the Chemung and North Branch Susquehanna Rivers, the dams are also meant to help decrease the acidity of water in the Tioga River downstream of the dams by dilution with the more neutral waters of Crooked Creek.

The lakes also offer recreational opportunities, including camping, boating, fishing, swimming, and hiking on area trails.