USGS Water-Year Summary 2020
03007800 ALLEGHENY RIVER AT PORT ALLEGANY, PA
LOCATION - Lat 41°49'07", long 78°17'35" referenced to North American Datum of 1927, McKean County, PA, Hydrologic Unit 05010001, on right bank 40 ft upstream from bridge on U.S. Highway 6 at Port Allegany, 1.1 mi upstream from Twomile Creek, 1.4 mi downstream from Allegheny Portage Creek, at river mile 285.5.
DRAINAGE AREA - 248 mi².
PERIOD OF RECORD - October 1974 to current year. Discharge measurements available from U.S. Army Corps of Engineers March 1971 to October 1974.
GAGE - Water-stage recorder, water-quality monitor, and heated tipping bucket precipitation gage. Datum of gage is 1,454.88 ft above National Geodetic Vertical Datum of 1929 (from benchmark). Satellite and landline telemetry at station.
COOPERATION - Station established and maintained by the U.S. Geological Survey. Funding for this station provided by the U.S. Army Corps of Engineers, Pittsburgh District, the New York State Department of Environmental Conservation and the U.S. Geological Survey.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Jun 23, 1972 reached a stage of at least 17.5 ft, discharge, 21,700 ft³/s, from U.S. Army Corps of Engineers indirect discharge measurement. Actual peak discharge may have been greater.
PERIOD OF RECORD - October 2010 to current year.
PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: November 2010 to current year.
DISSOLVED OXYGEN: July 2011 to current year (seasonal operation May to October).
WATER TEMPERATURE: November 2010 to current year.
pH: July 2011 to current year (seasonal operation May to October).
COOPERATION - Water-quality samples were collected as part of the Pennsylvania Department of Environmental Protection Water-Quality Network (WQN) with cooperation from the Pennsylvania Department of Environmental Protection.
INSTRUMENTATION - Continuous water-quality monitor interfaced with a data collection platform with 15-minute recording interval.
EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum, 320 microsiemens per centimeter, Aug 18, 2019; minimum, 41 microsiemens per centimeter, Dec 1, 2010.
WATER TEMPERATURE: Maximum, 30.6°C, July 22, 2011; minimum, -0.5°C, many days during winter periods. PH: Maximum, 8.5 standard units, May 27, 2020; minimum, 6.2 standard units, May 26, 29, 30, 2012, Jun 2, 6, 2012, Jun 26, 2014. DISSOLVED OXYGEN: Maximum, 14.1 mg/L, Apr 2, 2015; minimum, 4.6 mg/L Sep 29, 2020.