USGS Water-Year Summary 2019
01053500 ANDROSCOGGIN RIVER AT ERROL, NH
LOCATION - Lat 44°46'57", long 71°07'43" referenced to North American Datum of 1983, Coos County, NH, Hydrologic Unit 01040001, on right bank 0.4 mi downstream from Errol Dam, 0.4 mi northeast of Errol, and 0.6 mi upstream from Clear Stream.
DRAINAGE AREA - 1,046 mi².
- WDR ME-81-1: Drainage area. WDR ME-97-1: 1906-43(M) 1978-84(M).
PERIOD OF RECORD - DISCHARGE: January 1905 to current year. November and December 1912, monthly discharges only, published in WSP 1301. Prior to 1922, published as "at Errol Dam." Records for water years 1923-44 have not been published but are available in the files of the U.S. Geological Survey.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 1,227.30 ft above National Geodetic Vertical Datum of 1929. Prior to Dec. 8, 1943, nonrecording gage at Errol Dam at datum 5.0 ft higher.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 16,500 ft³/s, May 22, 1969, gage height 9.40 ft; minimum daily discharge, leakage only at various times when gates in dam were closed in water years 1918, 1919, 1923, 1924, 1928, and 1941.
PERIOD OF RECORD -
CHEMICAL ANALYSES: Water years 1955, 1958.
REVISED RECords: WDR ME-81-1: Drainage area. WDR ME-97-1: 1906-43(M) 1978-84(M).