USGS Water-Year Summary for Site 01589000

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	Available Parameters
	00060 Discharge(Mean)
	63680 Turbidity, Form Neph(Mean,Max.,Min.) [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

01589000 PATAPSCO RIVER AT HOLLOFIELD, MD

LOCATION - Lat 39°18'37.1", long 76°47'32.7" referenced to North American Datum of 1983, Baltimore County, MD, Hydrologic Unit 02060003, on left bank at upstream side of highway bridge at Hollofield, 0.3 mi downstream from Dogwood Run, 3.0 mi north of Ellicott City, and 28 mi upstream from mouth.

DRAINAGE AREA - 285 mi².

REVISIONS HISTORY - https://waterdata.usgs.gov/nwis/peak?site_no=01589000: 2013 (P). https://waterdata.usgs.gov/nwis/dv/?site_no=015890000: 2014.

SURFACE-WATER RECORDS

PERIOD OF RECORD - May 1944 to January 1992, March 1994 to September 1995, January 2000 to September 2004, April 2010 to current year.

GAGE - Water stage recorder and crest-stage gage. Datum of gage is 186.99 ft above North American Vertical Datum of 1988, from digital elevation model. Prior to May 1, 2010, at site on downstream side of bridge at same gage datum. Prior to June 22, 1972, water-stage recorder at site on opposite bank at same gage datum.

REMARKS -

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

Water Year 2017: Records good, except those above 800 cfs, which are fair, and those for estimated discharges, which are poor.

Water Years 2014-2016: 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, 11 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 Feb. 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 - January 1967 to September 1989. October 2010 to September 2015 (discontinued).

PERIOD OF DAILY RECORD - TURBIDITY: October 2010 to September 2015 (discontinued). SEDIMENT CONCENTRATION: October 2010 to September 2015 (discontinued). SEDIMENT LOAD: October 2010 to September 2015 (discontinued).

INSTRUMENTATION - Water-quality monitor and automatic sampler, October 2010 to September 2015 (discontinued).

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 2,430 NTU, September 30, 2015; minimum 0.0 NTU, on several days. SEDIMENT CONCENTRATION: Maximum daily mean, 2,660 mg/L (estimated), January 31, 2013; minimum daily mean, 0.3 mg/L, September 20, 2014. SEDIMENT LOAD: Maximum daily mean 65,200 tons (estimated), January 31, 2013; minimum daily mean 0.05 tons, September 20, 2014.