PROVISIONAL DATA SUBJECT TO REVISION
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LOCATION.--Lat 42°28'21.5", long
74°26'28.1" referenced to North American Datum of
1983, Schoharie County, NY, Hydrologic Unit 02020005, on right
bank at bridge on State Highway 30, 0.8 mi downstream from West
Brook, and 2 mi northeast of North Blenheim.
DRAINAGE AREA.--405 mi².
PERIOD OF RECORD.--November 2017 to current year.
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 766.54 ft above NAVD of 1988.
REMARKS.--Regulation of flow by New York Power Authority Blenheim-Gilboa Pumped Storage Project upstream from gage. Entire flow, runoff from 315 mi², except for periods of spill, diverted from Schoharie Reservoir through Shandaken Tunnel into Esopus Creek upstream from Ashokan Reservoir for water supply of City of New York. Water Years 2018-21: Records fair except those for estimated discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 43,300 ft³/s, Dec. 25, 2020, gage height, 18.45 ft, from rating curve extended above 20,000 ft³/s; minimum discharge, 10.5 ft³/s, Sept. 30, Oct. 1, 2019, gage height 1.72 ft; minimum gage height, 1.56 ft, June 29, 2021.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Aug. 28-29, 2011, reached a stage of 26.97 ft, from floodmark. Flood of Jan. 19-20, 1996, reached a stage of 22.72 ft, from floodmark. Flood of Apr. 4-5, 1987, reached a stage of 21.19 ft, from floodmark.
DRAINAGE AREA.--405 mi².
PERIOD OF RECORD.--November 2017 to current year.
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 766.54 ft above NAVD of 1988.
REMARKS.--Regulation of flow by New York Power Authority Blenheim-Gilboa Pumped Storage Project upstream from gage. Entire flow, runoff from 315 mi², except for periods of spill, diverted from Schoharie Reservoir through Shandaken Tunnel into Esopus Creek upstream from Ashokan Reservoir for water supply of City of New York. Water Years 2018-21: Records fair except those for estimated discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 43,300 ft³/s, Dec. 25, 2020, gage height, 18.45 ft, from rating curve extended above 20,000 ft³/s; minimum discharge, 10.5 ft³/s, Sept. 30, Oct. 1, 2019, gage height 1.72 ft; minimum gage height, 1.56 ft, June 29, 2021.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Aug. 28-29, 2011, reached a stage of 26.97 ft, from floodmark. Flood of Jan. 19-20, 1996, reached a stage of 22.72 ft, from floodmark. Flood of Apr. 4-5, 1987, reached a stage of 21.19 ft, from floodmark.
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