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Water-Year Summary for Site 03012520
Reservoir is formed by a concrete gravity dam with a gated spillway and with an earthfill section, rockfaced, at right side. Storage began during construction and reservoir acted as retention basin from October 1965 to December 1966. Dam became operational in January 1967. Reservoir first reached minimum pool elevation during period of construction. Capacity, 1,180,000 acre-ft between elevations 1,205.0 ft (invert of low level sluices) and 1,364.5 ft, (full pool). Dead storage is 128 acre-ft. Minimum pool elevation, 1,239.5 ft, (capacity, 24,240 acre-ft). Winter low-water pool elevation, 1,291.5 ft,(capacity, 239,780 acre-ft). Summer low-water pool elevation, 1,327.5 ft, (capacity, 572,610 acre-ft). Storage to summer pool normally occurs during period April to May. Depletion of low-water storage for augmenting flow in Allegheny River normally occurs during period July to December. Reservoir is used for flood control, low-flow augmentation and water-quality control of Allegheny River and downstream rivers, power generation, and recreation.
For the 2018 water year elevation record is good. For the 2019 water year elevation record is good.