USGS Water-Year Summary for Site 01580000

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	Available Parameters
	00060 Discharge(Mean)

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

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USGS Water-Year Summary 2024

01580000 DEER CREEK AT ROCKS, MD

LOCATION - Lat 39°37'47.9", long 76°24'11.9" referenced to North American Datum of 1983, Harford County, MD, Hydrologic Unit 02050306, on right bank 0.3 mi upstream from bridge on Cherry Hill Road, 0.8 mi southeast of Rocks, 1.2 mi upstream from Stirrup Run, and 23.5 mi upstream from mouth.

DRAINAGE AREA - 94.4 mi².

REVISIONS HISTORY -

WSP 726: Drainage area. WSP 1502: 1927-36 (maximum and minimum only 1927-29, maximum only 1930-32, 1936).

Discharge for Measurement 830 made on 02/07/2022 was revised on 07/11/2022 due to an error in computation.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1926 to current year. Monthly discharge only for November and December 1926, published in WSP 1302.

GAGE - Water-stage recorder and crest-stage gage. Concrete control since Sept. 7, 1938. Datum of gage is 249.60 ft above North American Vertical Datum of 1988.

REMARKS -

Water Years 2022-2023: Records fair, except those for estimated discharges, which are poor.

Water Year 2021: Records fair, except those for estimated discharges, which are poor. Maximum discharge, 2,810 ft³/s, Dec. 25, gage height, 7.27 ft, was independent of the same peak discharge that occurred Sept. 1, at the same gage height.

Water Year 2020: Records fair, except those for estimated discharges, which are poor.

Water Years 2017-2019: Records good, except 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.

Prior to 1965, some regulation at low flow by mills upstream from station. U.S. Geological Survey satellite data-collection platform at station.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since at least 1888, that of Aug. 23, 1933.