USGS Water-Year Summary 2020
01011000 ALLAGASH RIVER NEAR ALLAGASH, ME
LOCATION - Lat 47°04'11", long 69°04'46" referenced to North American Datum of 1983, Aroostook County, ME, Hydrologic Unit 01010002, on left bank 3.0 mi upstream from mouth and village of Allagash.
DRAINAGE AREA - 1,478 mi² of which 249 mi² probably is noncontributing. Drainage area is 1229 mi², not including 249 mi² drained by Chamberlain Lake through Telos Canal.
- WSP 1231: 1911. WDR ME-82-1: Drainage area.
PERIOD OF RECORD - DISCHARGE: July 1910 to November 1910, May to November 1911, September 1931 to current year. Monthly discharges only for some periods prior to November 1911, published in WSP 1301.
GAGE - Water-stage recorder. Datum of gage is 604.6 ft above National Geodetic Vertical Datum of 1929. Prior to December 1911, nonrecording gage at site 3.0 mi downstream at different datum.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 40,900 ft³/s, Apr. 30, 2008, gage height, 14.89 ft; maximum gage height, 19.78 ft, Apr. 10, 1991 (backwater from ice); minimum discharge, 87 ft³/s, Sept. 11, 1960.
PERIOD OF RECORD - CHEMICAL ANALYSES: Water years 1952-53, 1975, 1981.
PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: April 1975 to September 1980.
WATER TEMPERATURE: April 1975 to September 1980. October 2010 to September 2015 (discontinued).
SUSPENDED SEDIMENT DISCHARGE: October 1975 to September 1976.
INSTRUMENTATION - In-situ thermistor located on left bank 50 feet streamward of gage house and about 0.5 feet above river bed.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 28.5°C, July 15, 2012; minimum, -0.1°C, on many days during winter periods in water years 2011-2015.