Sinnemahoning State Park is on Pennsylvania Route 872, eight miles (13 km) north of the village of Sinnamahoning.

Native Americans began living in the Sinnemahoning State Park area 10,000 to 12,000 years ago.

They followed the receding glaciers and found that the area supported a bountiful supply of fish, wildlife, berries and nuts.

The Sinnemahoning area was left largely unsettled and wild until the late 19th century when the logging boom that spread throughout the mountains of Pennsylvania arrived.

The passing steam locomotives on the railroads would ignite this dry brush causing massive wildfires that swept through the mountains and valleys.

[2] George B. Stevenson Reservoir is a 142-acre (57 ha) manmade lake that was engineered by Gannett Fleming Corddry & Carpenter, Inc. and constructed by the Commonwealth of Pennsylvania in 1955 as part of the flood control project on the West Branch Susquehanna River.

These four reservoirs and dams control a total of 1,163 square miles (3,010 km2) of drainage area and provides flood prevention for the cities and towns downstream.

Common game fish at the park, in the lake and streams, are brook, rainbow and brown trout, catfish, crappie, tiger muskellunge, smallmouth and largemouth bass, sunfish, bluegill, perch and pickerel.

The common game species are black bears, eastern gray squirrels, ruffed grouse, waterfowl, white-tailed deer, and turkeys.