USGS Water-Year Summary for Site 03072655

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Min.,Mean,Max.)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

03072655 MONONGAHELA RIVER NEAR MASONTOWN, PA

LOCATION - Lat 39°49'30", long 79°55'23" referenced to North American Datum of 1927, Greene County, PA, Hydrologic Unit 05020005, on left bank, 84 ft upstream from Lock and Dam at Grays Landing, 0.9 mi upstream from Masontown, 1.2 mi upstream from Whitley Creek, 5.3 mi downstream from Dunkard Creek, 7.6 mi downstream from Cheat River, at river mile 81.9.

DRAINAGE AREA - 4,440 mi².

REVISIONS HISTORY - WSP 1113: 1939 (M), 1941 (M). WSP 1435: 1939. WSP 1907: 1936 (M), 1955 (M).

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1938 to current year. Published as "at Greensboro" (Station 03072500) October 1938 to September 1995. Prior to January 1939 monthly discharge only, published in WSP 1305.

GAGE - Water-stage recorder and concrete dam control. Datum of gage is 768.5 ft above North American Vertical Datum of 1988 (GNSS survey). Prior to Nov 9, 1990, at datum 1.45 ft lower. Prior to February 16, 2024, the datum of gage was reported as 769.00 ft above National Geodetic Vertical Datum of 1929. Satellite telemetry at station.

COOPERATION - Station established and maintained by the U.S. Geological Survey. Funding for this station is provided by the U.S. Army Corps of Engineers, Pittsburgh District, the Pennsylvania Department of Environmental Protection and the U.S. Geological Survey.

REMARKS -

Flow regulated since 1926 by Lake Lynn 11 mi upstream, since May 1938, by Tygart Lake 69 mi upstream, and since April 1989 by Stonewall Jackson Lake 120.6 mi upstream, combined capacity, 432,000 acre-ft. Records good except those for discharge below 2,000 cfs and estimated discharge, which are poor.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Jul 1888 reached a stage of about 36 ft, from high-water profile by U.S. Army Corps of Engineers. Flood of Mar 18, 1936, reached a stage of 28.4 ft(from floodmark), discharge, 130,000 ft³/s.

WATER-QUALITY RECORDS

PERIOD OF RECORD - October, 2013 to current year.

PERIOD OF DAILY RECORD - WATER TEMPERATURE: October 2013 to current year (seasonal, May to October). SPECIFIC CONDUCTANCE: October 2013 to current year (seasonal. May to October). pH: October 2013 to current year (seasonal, May to October). DISSOLVED OXYGEN: October 2013 to current year (seasonal, May to October).

INSTRUMENTATION - Water quality monitor, measuring water temperature, specific conductance, pH, and dissolved oxygen at a 15-minute sampling interval.

REMARKS -

Values reported by the monitor may not be representative of the entire river width. Cross-sectional water quality data is available upon request.

Historically, water temperatures below 0 degrees Celsius were not reported. Water temperature sensors now have the ability to accurately read water temperatures below 0 degrees Celsius.

Data collection for dissolved oxygen discontinued November through April. Other interruptions in the records due to equipment malfunctions.

For water year 2014, records for water temperature, specific conductance, and dissolved oxygen are rated good. Records for pH are rated good, except for September 13-16, which are rated fair.

For water year 2015, records for water temperature, specific conductance, pH and dissolved oxygen are rated good.

For water year 2016, records for water temperature, specific conductance, pH and dissolved oxygen are rated good.

For water year 2017, records for water temperature and dissolved oxygen are rated good. Records for specific conductance are rated good, except for August 29 to September 10, which are fair, September 11-27, which are poor. Records for pH are rated good, except for June 6 to September 27, which are fair.

For water year 2018, records for water temperature, specific conductance, and dissolved oxygen are rated good. Records for pH are rated good, except for June 27-September 30, which are fair.

Beginning in water year 2019, water quality records are not rated as "excellent", "good", "fair", or "poor".

EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: maximum, 29.4°C, July 22, 2020; minimum, 0.0° C, January 24-26, 2016. SPECIFIC CONDUCTANCE: maximum, 640 microsiemens per centimeter, June 16, 2015; minimum, 85 microsiemens per centimeter, June 30, 2019. pH: maximum, 8.1 standard units, May 24, 2021; minimum, 6.7 standard units, several days in July and August, 2016 and September, 2017.