Keystone Lake (Armstrong County, Pennsylvania)
Keystone Lake (also known as Keystone Reservoir and Plum Creek Reservoir) is a reservoir in Armstrong County in the U.S. state of Pennsylvania. The elevation of Keystone Lake is 1076 feet above sea level.
Coordinates: 40°45′02″N 79°17′09″W / 40.750557°N 79.285899°W
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