USGS Water-Year Summary for Site 03081000

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

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

03081000 YOUGHIOGHENY RIVER BELOW CONFLUENCE, PA

LOCATION - Lat 39°49'39", long 79°22'22" referenced to North American Datum of 1927, Fayette County, PA, Hydrologic Unit 05020006, on left bank 1.0 mi downstream from Casselman River, 1.5 mi northwest of Confluence, at river mile 72.0.

DRAINAGE AREA - 1,029 mi².

REVISIONS HISTORY - Dissolved oxygen record for June 30, 2018 to July 3, 2018 revised on May 1, 2020. Drop in dissolved oxygen concentrations was likely due to temporary fouling. The affect data were deleted.

SURFACE-WATER RECORDS

PERIOD OF RECORD - June 1940 to current year. Monthly discharge only for June 1940, published in WSP 1305.

GAGE - Water-stage recorder. Datum of gage is 1,302.3 ft above North American Vertical Datum of 1988. Prior to January 4, 2024, the datum of gage was reported as 1,302.77 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 Pennsylvania Department of Environmental Protection, the U.S. Army Corps of Engineers, Pittsburgh District and the U.S. Geological Survey.

REMARKS - Flow regulated since January 1925 by Deep Creek Reservoir 28 mi upstream and since December 1942 by Youghiogheny River Lake (03077000) 1.7 mi upstream. Record is considered good, except for estimated discharge which is poor.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Mar 17, or 18, 1936 reached a stage of 21.6 ft, from floodmarks, discharge, 85,000 ft³/s.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: October 2004 to current year. pH: October 2004 to current year. WATER TEMPERATURE: October 2004 to current year. DISSOLVED OXYGEN: October 2004 to current year (seasonal operation).

COOPERATION - Station established and maintained by the U.S. Geological Survey in cooperation with the U.S. Army Corps of Engineers, Pittsburgh District.

INSTRUMENTATION - Continuous water-quality monitor interfaced with a data collection platform with 15-minute recording interval.

REMARKS -

Values measured by the monitor may not be representative of the entire river width due to the influence of the Casselman River, which joins with the Youghiogheny River one mile upstream on the right (eastern) bank. Data collection for dissolved oxygen is discontinued during the winter months. Other interruptions in the record were due to equipment malfunctions or fouling.

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.

For water year 2014, records for water temperature, pH, and dissolved oxygen are rated good. Records for specific conductance are rated good, except for November 26 to December 6 and May 7-14, which are rated fair, and November 21-25, which are rated poor.

For water year 2015, records for water temperature, specific conductance, and dissolved oxygen are rated good. Records for pH are rated good, except for April 20 to September 30, which are rated fair.

For water year 2016, records for water temperature are rated good, except for December 2 to June 15 and August 12 to September 30, which are rated fair, and June 16 to August 11, which are rated poor. Records for specific conductance are rated good, except for August 16-18, which are rated fair, and August 19-25, which are rated poor. Records for pH are rated fair. Records for dissolved oxygen are rated good, except for March 16 to June 15, which are rated fair, and June 16 to August 11, which are rated poor.

For water year 2017, records for water temperature are rated good. Records for specific conductance are rated good, except for June 7 to July 18, which are poor. Records for pH are rated good, except for July 18 to September 30, which are poor. Records for dissolved oxygen are rated poor.

For water year 2018, records for water temperature and dissolved oxygen are rated good. Records for specific conductance are rated good, except for August 8 to September 8, which are fair, and September 9-30, which are poor. Records for pH are rated good, except for June 6 to 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 - SPECIFIC CONDUCTANCE: Maximum, 307 microsiemens/cm, Oct 25, 2004; minimum, 63 microsiemens/cm, Sep 10, 2018. pH: Maximum, 7.8 standard units, on Aug 6 and 7, 2009; minimum, 5.8 standard units, June 13, 2005. WATER TEMPERATURE: Maximum, 23.2°C, Oct 3, 2019; minimum, -0.2°C, Jan. 23-25, 2016.