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Water-Year Summary for Site 03012520

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Available Parameters
62615 Elevation, lake/res, NAVD88(Mean)  

Water year 2021: 2021-10-01 to 2022-09-30
 

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USGS Water-Year Summary 2021
03012520 ALLEGHENY RESERVOIR NEAR WARREN, PA
LOCATION - Lat 41°50'17", long 79°00'10" referenced to North American Datum of 1927, Warren County, PA, Hydrologic Unit 05010001, in Allegheny National Forest, at control house at Kinzua Dam on Allegheny River, 3 mi upstream from Hemlock Run, and 7 mi east of Warren.
DRAINAGE AREA - 2,180 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1965 to September 2015 (elevation and contents), October 2015 to current year (elevation). Prior to October 1966 published as Allegheny River Reservoir.
GAGE -

Water-stage recorder. Datum of gage is referenced to North American Vertical Datum 1988 (NAVD88), US Army Corps of Engineers benchmark. Prior to October 2009, datum of gage was referenced to National Geodetic Vertical Datum of 1929 (NGVD29). Conversion from NGVD29 to NAVD88 at this location is: NGVD29 elevation - 0.47 ft = NAVD88 elevation. Satellite telemetry at station.

Datum of gage is referenced to NAVD 88 elevation.  There is no arbitrary local gage datum.  NAVD elevations were established October 2009 by 3rd party TerraSurv under contract with Pittsburgh COE.  Height Modernization project within accuracy of .03 m.  project benchmark M1 (NSRS PID DL1916) elevation (1379.062 ft.) computed by gps)  Differential levels were run to BM K1: Project Benchmark is a USACE disk set on top of the left bank downstream concrete wall of the dam.; 1378.964 ft on 06/11/19 at 09:18 AM (Active, Origin Point)  BM K1 is used as the origin point for routine station levels last run by USGS personnel in 6/11/2019.

COOPERATION - Station established and maintained by the U.S. Geological Survey in cooperation with the U.S. Army Corps of Engineers, Pittsburgh District.
REMARKS -

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. For the 2020 water year elevation record is good.

EXTREMES FOR PERIOD OF RECORD - Maximum contents, 1,121,120 acre-ft, Jun 27,1972, elevation, 1,361.73 ft; minimum (after first filling), 113,310 acre-ft, Jan 26, 1968, elevation, 1,268.21 ft.