USGS Water-Year Summary 2020
03086500 Mahoning River at Alliance, OH
LOCATION - Lat 40°55'58", long 81°05'41" referenced to North American Datum of 1927, Stark County, OH, Hydrologic Unit 05030103, on the right bank 15 ft upstream from Webb Avenue Bridge in Alliance, 0.2 mi upstream from waterworks dam and 4 mi upstream from Beech Creek.
DRAINAGE AREA - 89.2 mi².
- WSP 1907: Drainage area.
PERIOD OF RECORD - Continuous discharge gage, August 1941 to September 1993; recording crest-stage gage, October 1994 to Sept. 30, 2007; water temperature, November 2010 to current year.
GAGE - Water-stage recorder and concrete dam. Datum of the gage is 1,034.79 ft (NAVD 1988). Prior to July 2015, datum of gage was 1,035.30 ft (1912 adjustment). Prior to Aug. 22, 2015 the gage datum was 2 ft higher at 1,037.30 ft (1912 adjustment).
COOPERATION - Peak stage only station, maintained with the U.S. Army Corps of Engineers, Pittsburgh District.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 9,740 ft³/s, Jan. 21, 1959, gage height, 9.11 ft.
PERIOD OF RECORD - November 2010 to current year.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: November 2010 to current year.
INSTRUMENTATION - Temperature probe. Electronic data logger set for 15 min. interval.
EXTREMES FOR PERIOD OF RECORD - WATER TEMPERATURES: Maximum, 29.1 °C, June 24, 2013; minimum, -0.1 °C, multiple days during winter months.