USGS Water-Year Summary for Site 01518700

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

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

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USGS Water-Year Summary 2024

01518700 TIOGA RIVER AT TIOGA JUNCTION, PA

LOCATION - Lat 41°57'09", long 77°06'56" referenced to North American Datum of 1927, Tioga County, PA, Hydrologic Unit 02050104, on left bank 0.3 mi upstream from bridge on Township Route 722 at Tioga Junction, 3.3 mi downstream from Crooked Creek, and 5.0 mi downstream from Tioga and Hammond Dams.

DRAINAGE AREA - 446 mi².

REVISIONS HISTORY - Revisions: Prior to October 2, 2023, the datum of gage was erroneously reported as 990.43 ft above National Geodetic Vertical Datum of 1929.

SURFACE-WATER RECORDS

PERIOD OF RECORD - July 1976 to current year.

GAGE - Water-stage recorder and water-quality monitor. Datum of gage is 987.62 ft above North American Vertical Datum of 1988. Prior to October 2, 2023, the datum of gage was erroneously reported as 990.43 ft above National Geodetic Vertical Datum of 1929. Satellite and landline telemetry at station.

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

REMARKS - Flow regulated since November 1979 by Tioga Dam (station 01517900) and Hammond Dam (station 01518498). Records are good except those for estimated discharge, which are poor.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of September 1975 reached a stage of about 22.1 ft, from floodmarks, discharge, about 48,000 ft³/s.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1969 to 1972, 1973 to current year.

PERIOD OF DAILY RECORD - WATER TEMPERATURE: October 1976 to September 1985; October 2015 to current year. SPECIFIC CONDUCTANCE: October 1976 to September 1985; October 2015 to current year. pH: October 1976 to September 1985; October 2015 to current year. DISSOLVED OXYGEN: October 1976 to September 1977.

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. Continuous water quality records were collected by the U.S. Geological Survey in cooperation with the U.S. Army Corps of Engineers, Baltimore District.

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

REMARKS - As of October 2013, results from discrete water quality samples collected at this site are available through the U.S. Geological Survey National Water Information System web interface on the "Water Quality for the Nation" webpage. Analyses for pH, water temperature, specific conductance, and dissolved oxygen were performed on site. All other sample analyses were performed at the Pennsylvania Department of Environmental Protection laboratory in Harrisburg, PA. Occasionally, values for filtered parameters may exceed values for the corresponding unfiltered parameter. These results are within the limits of analytical precision and methods. 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. Subsequent to water year 2015, water temperatures below 0 degrees Celsius are reported.

EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 29.5°C, July 21, 1980; minimum, -0.1°C, on many days during winter periods. SPECIFIC CONDUCTANCE: Maximum, 460 microsiemens/cm, Aug. 26, 1979; minimum, 67 microsiemens/cm, Mar. 8, 1979. pH: Maximum, 9.2 std units, May 22, 23, 25, 2023; minimum, 5.1 std units, Sept. 8, 1977, Aug. 26, Sept. 15, 23, 1979.