USGS Water-Year Summary for Site 03079000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(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

03079000 CASSELMAN RIVER AT MARKLETON, PA

LOCATION - Lat 39°51'35.7", long 79°13'43.8" referenced to North American Datum of 1983, Somerset County, PA, Hydrologic Unit 05020006, on right bank at downstream side of highway bridge on Markleton School Road (SR3011) at Markleton, 2 mi southwest of Casselman, and 7 mi downstream from Coxes Creek.

DRAINAGE AREA - 382 mi².

REVISIONS HISTORY - WSP 743: Drainage area. WSP 1305: 1923-31. WSP 1435: 1932-34, 1935 (M), 1936-38. WSP 1625: 1924 (M).

SURFACE-WATER RECORDS

PERIOD OF RECORD - August to September 1913 (gage heights and discharge measurements only), October 1920 to current year. Monthly discharge only for some periods, published in WSP 1305. October 1913 to September 1920 (gage heights and discharge measurements only) in reports of Water Supply Commission of Pennsylvania.

GAGE - Water-stage recorder. Datum of gage is 1,654.8 ft above North American Vertical Datum of 1988. Prior to Nov. 19, 1940, nonrecording gage at same site and datum. Prior to January 3, 2024, the datum of gage was reported as 1,655.29 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 provided by the U.S. Army Corps of Engineers, Pittsburgh District, the Pennsylvania Department of Environmental Protection and the U.S. Geological Survey.

REMARKS - Slight diversion upstream of station to city of Frostburg, MD, in the Potomac River Basin. Records are good except those for estimated daily discharge, which are poor.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: June 2005 to September, 2011 (seasonal, April to October). October, 2011 to current year. PH: June 2005 to current year (seasonal, April to October). WATER TEMPERATURE: June 2005 to September, 2011 (seasonal, April to October). October 2011 to current year.

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 -

Water temperature and specific conductance are monitored year-round. pH is monitored from May to October. Additional interruptions in the records were due to equipment malfunctions.

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 and pH are rated good. Records for specific conductance are rated good, except for February 9-22 and May 26 to June 5, which are rated fair, and February 23 to March 25 and June 14-25, which are rated poor.

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

For water year 2016, records for water temperature and specific conductance are rated good. Records for pH are rated good, except for May 21 to June 15, which are fair.

For water year 2017, records for water temperature, specific conductance, and pH are rated good.

For water year 2018, records for water temperature and specific conductance are rated good, except for February 2 to February 12, which are fair. Records for pH are rated good.

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

EXTREMES FOR PERIOD OF RECORD - WATER TEMPERATURE: maximum, 32.2°C Jul 7, 2012; minimum, -0.2°C, many days during winter periods. SPECIFIC CONDUCTANCE: maximum, 1190 microsiemens/cm, February 17, 2021; minimum, 89 microsiemens/cm, September 9, 2018.