USGS Water-Year Summary for Site 03049640

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00065 Gage height(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

03049640 ALLEGHENY RIVER ABOVE LOCK AND DAM NO. 3 AT ACMETONIA, PA

LOCATION - Lat 40°32'10", long 79°48'54" referenced to North American Datum of 1927, Westmoreland County, PA, Hydrologic Unit 05010009, on left bank 15 ft upstream from upper gate on river wall, at river mile 14.5.

DRAINAGE AREA - 11,592 mi².

REVISIONS HISTORY - Revisions: The datum of gage was erroneously reported at 740 ft above National Geodetic Vertical Datum of 1929 prior to November 4, 2022

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 2015 to current year.

GAGE - Water stage recorder, staff gage and water-quality monitor. Datum of gage is 725.2 ft above North American Vertical Datum of 1988. Prior to February 15, 2024, the datum of gage was reported as 725.8 ft above National Geodetic Vertical Datum of 1929 (NGVD29). Prior to November 4, 2022, the datum of gage was erroneously reported as 740 ft above NGVD29. Satellite telemetry at station.

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

REMARKS -

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 (data collection suspended during the winter months). Other interruptions in data were due to instrument malfunctions.

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

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

REMARKS -

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.

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

Data collection for dissolved oxygen is suspended during the winter months. Other interruptions in the record were due to equipment malfunctions.

For water year 2014, records for specific conductance, pH, and water temperature are rated good. Records for dissolved oxygen are rated good, except for October 1-24, which are rated poor.

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

For water year 2016, records for water temperature and dissolved oxygen are rated fair. Records for specific conductance and dissolved oxygen are rated poor.

For water year 2017, records for water temperature and specific conductance are rated good. Records for pH are rated good, except for April 29 to May 31, which are fair. Records for dissolved oxygen are rated good, except for May 3 to August 31, which are poor.

For water year 2018, records for water temperature and specific conductance are rated good, except for April 30 to June 22, which are fair. Records for pH and dissolved oxygen are rated good, except for April 30 to September 30, which are fair.

For water year 2019, records for water temperature and dissolved oxygen are rated good. Records for specific conductance are rated fair. Records for pH are good except for May 21 - June 27 and September 5 - October 7, which are fair.

Beginning water year 2020, water quality records are no longer rated as "excellent", "good", "fair", or "poor".

EXTREMES FOR PERIOD OF RECORD - SPECIFIC CONDUCTANCE: Maximum, 509 microsiemens/cm, Oct 4, 2010; minimum, 106 microsiemens/cm, Jan. 14, 2018. pH: Maximum, 8.5 standard units, Oct. 31, Dec. 17, 2005; minimum, 6.3 standard units, Feb. 16, 22-24, 2006. WATER TEMPERATURE: Maximum, 30.6°C, Aug. 4, 2006; minimum, -0.3°C, several days during winter periods.