USGS Water-Year Summary for Site 01589025

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	Available Parameters
	00060 Discharge(Mean)
	63680 Turbidity, Form Neph(Min.,Max.,Mean) [Discontinued]
	80154 Suspnd sedmnt conc(Mean) [Discontinued]
	80155 Suspnd sedmnt disch(Mean) [Discontinued]

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

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USGS Water-Year Summary 2024

01589025 PATAPSCO RIVER NEAR CATONSVILLE, MD

LOCATION - Lat 39°15'04.5", long 76°45'49.6" referenced to North American Datum of 1983, Baltimore County, MD, Hydrologic Unit 02060003, on left bank at highway bridge on Ilchester Road, 0.9 mi southwest of Catonsville, 2.0 mi southeast of Ellicott City, and 3.1 mi northeast of Columbia.

DRAINAGE AREA - 301 mi². from automated delineation using 30-meter National Elevation Dataset, digital elevation model data, dated 2006.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 2010 to current year.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 66.20 ft above North American Vertical Datum of 1988.

REMARKS -

Water Years 2018-2023: Records fair, except those for estimated discharges, which are poor.

Water Year 2017: Records good, except those above 400 cfs, which are fair, and those for estimated discharges, which are poor.

Water Year 2016: Records good, except those for October 1-November 5, which are fair, and those for estimated daily discharges, which are poor.

Water Year 2015: Records fair, except those for estimated daily discharges, which are poor.

Water Year 2014: Records good, except those for estimated daily discharges, which are poor.

Water Year 2013 and prior years’ accuracy statements can be found in Annual Water Data Reports.

Flow regulated by Liberty Reservoir, approximately 18 mi upstream, beginning July 22, 1954, usable capacity, 42,070,000,000 gal; dead storage, 1,260,000,000 gal. Diversions upstream from station for municipal supply of Westminster (sewage effluent discharged into Little Pipe Creek), and from Liberty Reservoir beginning February 26, 1953, for municipal supply of Baltimore, and beginning February 1970 for a small municipal supply for part of Carroll County. U.S. Geological Survey satellite data-collection platform at station.

WATER-QUALITY RECORDS

PERIOD OF RECORD - October 2010 to October 2021.

PERIOD OF DAILY RECORD - TURBIDITY: October 2010 to October 2021 SEDIMENT CONCENTRATION: October 2010 to October 2021. SEDIMENT LOAD: October 2010 to October 2021.

INSTRUMENTATION - Water-quality monitor and automatic sampler, October 2010 to current year.

REMARKS - Sediment discharge loads and concentrations were estimated for days of estimated daily discharges. Turbidity values greater than 1,600 nephelometric turbidity units (NTU) exceed the instrument calibration range. Values are included in the record but are presumed to have lower precision. Turbidity values that were determined to be a result of debris on the sensor, a function of incident sun angle, or other phenomena that did not appear to be correlated to suspended-sediment concentration were removed by the hydrographer. Extended periods of missing data are due to equipment malfunctions.

EXTREMES FOR PERIOD OF DAILY RECORD - TURBIDITY: Maximum 2480 NTU, April 16, 2018; minimum 0.0 NTU, on several days. SEDIMENT CONCENTRATION: Maximum daily mean, 2,700 mg/L, January 31, 2013; minimum daily mean, 0.1 mg/L, September 29, 2014. SEDIMENT LOAD: Maximum daily 104,000 tons, April 30, 2014; minimum daily 0.02 tons, September 29, 2014.