The tributary First Fork Sinnemahoning Creek joins 3.7 miles (6.0 km) downstream of Driftwood. Sinnemahoning Creek continues 12.0 miles (19.3 km) to join the West Branch Susquehanna River at the village of Keating.
Trout Run joins approximately 7.5 miles (12.1 km) downstream at the community of Benezette, Elk County.
The Bennett Branch continues for 17.6 miles (28.3 km) to join the Driftwood Branch at the borough of Driftwood to form Sinnemahoning Creek.
Clear Creek then North Creek join the Driftwood Branch downstream of the community of Rich Valley.
West Creek joins downstream at the borough of Emporium, Cameron County.
Sinnemahoning Portage Creek joins approximately 1.0 mile (1.6 km) downstream.
The Driftwood Branch continues for 19.6 miles (31.5 km) to join the Bennett Branch at the borough of Driftwood to form Sinnemahoning Creek.
The East Fork joins 5.6 miles (9.0 km) downstream at the community of Wharton, Potter County.
The dam creates the George B. Stevenson Reservoir, a 142-acre (57 ha) lake constructed by the Commonwealth of Pennsylvania in 1955 as part of the flood control project on the West Branch Susquehanna River. It is one of four such dams in the river basin. The other reservoirs are at Kettle Creek State Park, Curwensville and Bald Eagle State Park. These four reservoirs and dams control a total of 1,163 square miles (3,010 km2) of drainage area and provide flood prevention for the cities and towns downstream.
The reservoir is open to some recreational boating, fishing and ice fishing. Gas-powered motors are prohibited; motorized boats must be powered by electric motors only. Sailboats, rowboats, canoes, kayaks, and paddleboats are permitted on the waters of the lake. All boats must be properly registered with any state. The reservoir is open to ice fishing during the winter months when the lake is frozen.
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