USGS Water-Year Summary 2024

01574700 INDIAN ROCK DAM NEAR YORK, PA

LOCATION - Lat 39°55'22", long 76°45'14" referenced to North American Datum of 1927, York County, PA, Hydrologic Unit 02050306, at dam on Codorus Creek, 0.1 mi upstream from mouth of South Branch Codorus Creek, 0.3 mi west of York Water Co. pumping station, and 3.0 mi southwest of York.

DRAINAGE AREA - 93.7 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - September 1962 to September 2016 (elevation and contents) and October 2016 to current year (elevation) in reports of Geological Survey, September 1942 to August 1962 in files of Baltimore District, U.S. Army Corps of Engineers.

GAGE - Water-stage recorder. Datum of gage is U.S. Army Corps of Engineers local project datum. Prior to water year 2007, the datum was incorrectly reported as NGVD 1929. Satellite and landline telemetry at station.

COOPERATION - Funding for the operation of this station is provided by the U.S. Army Corps of Engineers, Baltimore District.

REMARKS - Reservoir formed by an earth and rockfill dam with ungated concrete spillway at elevation 435.00 ft (capacity, 28,000 acre-ft). Reservoir completed in June 1942; storage began in June 1946. No dead storage. Reservoir is used for flood control. Figures given herein represent total contents. Flood storage is regulated by three vertical-lift tractor gates. Water is stored only during high flows and released when downstream conditions warrant.

EXTREMES FOR PERIOD OF RECORD - Maximum contents, 30,200 acre-ft, Jun 23, 1972, elevation, 436.44 ft; minimum, no storage many days most years.