The Seneca Pumped Storage Reservoir is a 100-acre artificial lake located near Warren, Pennsylvania that holds 2.1 billion gallons of water. Completed in 1970, it functions as part of a hydroelectric power generation system connected to the Kinzua Dam on the Allegheny River.

The reservoir is bowl-shaped and circular, roughly the size of a NASCAR track. It sits atop a bluff approximately 800 feet above the Allegheny River. The reservoir experiences significant daily water level fluctuations of up to 50 feet as water is pumped up from the river at night and released during the day for power generation.

Access to the reservoir is limited by a 6-mile gravel road, which is not maintained in winter as it serves as a snowmobile route. The water is known for its poor visibility and turbidity.

Adjacent to the reservoir is the larger Allegheny Reservoir created by the Kinzua Dam, which stretches 25 miles upriver toward Salamanca, New York. The Allegheny Reservoir reaches into the Allegany Reservation of the Seneca Nation.

Due to the reservoir's primary function as an industrial pumped storage facility, its daily water level changes, and poor water clarity, paddlers should carefully evaluate their safety before attempting recreation here. No designated launch sites or facilities for paddlers are currently in place.

Historical Note: The reservoir and associated power station were built by the Pennsylvania Electric Company and Cleveland Electric Illuminating Company, marking an important development in the region's power infrastructure. The facility has generated hundreds of millions of dollars in profits since its opening.