USGS Water-Year Summary for Site 03025500

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

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USGS Water-Year Summary 2024

03025500 ALLEGHENY RIVER AT FRANKLIN, PA

LOCATION - Lat 41°23'22", long 79°49'14" referenced to North American Datum of 1927, Venango County, PA, Hydrologic Unit 05010003, on right bank at upstream side of Eighth Street bridge on U.S. Highway 322 at Franklin, 1,000 ft downstream from French Creek, at river mile 124.4.

DRAINAGE AREA - 5,982 mi².

REVISIONS HISTORY -

WSP 743: Drainage area. WSP 783: 1913 (M). WSP 1003: 1920 (M). WSP 1305: 1926 (M), 1928-29 (M). WSP 1385: 1920, 1932.

Revisions: Peak discharge for water year 1996 previously reported on 1/19/1996 was revised to 5/11/1996 on 10/30/2019. The previously reported peak occurred during a period of backwater; the open water peak and associated gage height is now reported.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1914 to current year. Monthly discharge only for some periods, published in WSP 1305. Gage-height records collected at same site since April 1905 are contained in reports of U.S. Weather Bureau.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 955.3 ft above North American Vertical Datum of 1988. Prior to January 4, 2023, the datum of gage was reported as 955.84 ft above National Geodetic Vertical Datum of 1929. Prior to Sept 16, 1932, non-recording gage, and Sept 16-30, 1932, water-stage recorder, at present site at datum 2.00 ft higher. Satellite telemetry at station.

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

REMARKS -

Flow regulated since December 1940 by Tionesta Lake (station 03020000), since November 1949 by Chautauqua Lake, since October 1965 by Allegheny Reservoir (station 03012520), since July 1970 by Union City Reservoir (station 03021518), and since January 1974 by Woodcock Creek Lake (station 03022550). Record good except those for estimated daily discharge, which is poor.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Mar 17, 1865 reached a stage of 25.0 ft, and that of Mar 26, 1913 a stage of 24.6 ft, from graph based on gage readings, discharges about, 200,000 ft³/s and 190,000 ft³/s, respectively, from rating curve extended above 111,000 ft³/s. Maximum discharge since at least 1864 is that of Mar 17, 1865.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: June 2011 to current year. pH: June 2011 to September, 2018 (seasonal operation, May to October). WATER TEMPERATURE: June 2011 to September, 2018. DISSOLVED OXYGEN: June 2011 to September, 2018 (seasonal operation, May to October).

INSTRUMENTATION - Continuous water-quality monitor interfaced with a data collection platform with 15-minute recording interval. Satellite telemetry at station. Water-quality monitor is located near the right bank, approximately 1.0 mi downstream from the confluence of French Creek. Data values from the monitor site may not be representative of the entire width of the river.

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. 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.

Data collection for pH and dissolved oxygen suspended in winter months. Other interruptions in the records were due to equipment malfunctions.

Data recorded by the monitor may not be representative of the entire river width.

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.

Cross-sectional water quality data is available upon request.

For water year 2015, records for water temperature, specific conductance, and pH are good. Records for dissolved oxygen are good, except for September 4-30, which are fair. For water year 2016, records for water temperature and specific conductance are rated good. Records for dissolved oxygen are rated fair. except for July 30 to August 28, which are poor. Records for pH are rated fair, except for March 13 to May 30 and July 30 to August 28, which are poor. For water year 2017, records for water temperature, pH, and dissolved oxygen are rated good. Records for specific conductance are rated good, except for September 21-30, which are fair. For water year 2018, records for water temperature are rated good. Records for specific conductance are rated good, except for April 18-20, which are fair, and October 1 to December 12, which are poor. Records for dissolved oxygen and pH are rated good, except for October 1 to October 31, which are fair.

EXTREMES FOR PERIOD OF RECORD - WATER TEMPERATURE: Maximum, 35.0°C, July 22, 2011; minimum, -0.3°C, on many days during winter periods. SPECIFIC CONDUCTANCE: Maximum, 696 micromsiemens/cm, February 2, 2011; minimum, 93 microsiemens/cm, January 13, 2017.