USGS Water-Year Summary for Site 01649500

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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.)
	63680 Turbidity, Form Neph(Min.,Max.,Mean)
	63680 Turbidity, Form Neph(Max.,Mean,Min.) [TS087, Discontinued]

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

01649500 NORTHEAST BRANCH ANACOSTIA RIVER AT RIVERDALE, MD

LOCATION - Lat 38°57'36.9", long 76°55'33.5" referenced to North American Datum of 1983, Prince George's County, MD, Hydrologic Unit 02070010, on left bank 100 feet downstream of bridge on Riverdale Road, 1.8 mi downstream from Indian Creek, and 1.8 mi upstream from confluence with Northwest Branch.

DRAINAGE AREA - 72.8 mi².

REVISIONS HISTORY -

WDR MD-DE-75-1: 1972(M).

Datum of gage above North American Vertical Datum of 1988 was revised on September 26, 2023.

SURFACE-WATER RECORDS

PERIOD OF RECORD - August 1938 to current year.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 11.55 ft above North American Vertical Datum of 1988. Prior to June 12, 1942, nonrecording gage; June 12, 1942 to Mar. 22, 1966, and Apr. 12, 1967 to Sept. 3, 1969, water-stage recorder, all at bridge at datum 14.00 ft above National Geodetic Vertical Datum of 1929. Mar. 23, 1966 to Apr. 11, 1967, nonrecording gage 600 ft downstream from bridge at datum 9.25 ft above National Geodetic Vertical Datum of 1929. Sept. 3, 1969 to Jan. 12, 2012, recording gage on right bank at downstream side of bridge at present gage datum.

REMARKS -

Water Years 2019-2022: Records fair, except those above 2,500 ft³/s, and those for estimated discharges, which are poor.

Water Year 2018: Records good, except those above 2,500 ft³/s, and those for estimated discharges, which are poor.

Water Year 2017: Records good, except those above 1,000 ft³/s, and those for estimated discharges, which are poor.

Water Year 2016: Records good, except those above 1,000 ft³/s, and those for estimated daily discharges, which are poor.

Water Years 2014-2015: Records fair, except those above 1,000 ft³/s, and those for estimated daily discharges, which are poor.

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

Some regulation at low flow by sand and gravel plants upstream from station. U.S. Geological Survey satellite data-collection platform at station.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Aug. 23 or 24, 1933, reached a stage of about 15.5 ft at datum 14.00 ft above National Geodetic Vertical Datum of 1929, from floodmarks; discharge, 10,500 ft³/s, from rating curve extended above 3,000 ft³/s on basis of velocity-area study.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: December 2003 to December 2005, July 2006 to November 2007, March 2008 to current year. WATER TEMPERATURE: December 2003 to December 2005, July 2006 to November 2007, March 2008 to current year. pH: December 2003 to December 2005, July 2006 to November 2007, March 2008 to current year. TURBIDITY: December 2003 to December 2005, July 2006 to November 2007, March 2008 to current year. DISSOLVED OXYGEN: December 2003 to December 2005, July 2006 to November 2007, March 2008 to current year.

COOPERATION - Funding for water-quality data collection is provided by the Prince George's County Department of Environmental Resources and the U.S. Geological Survey.

INSTRUMENTATION - Water-quality monitor December 2003 to December 2005, July 2006 to November 2007, March 2008 to current year.

REMARKS - For 2015 WY. Turbidity values greater than 1,000 formazin nepthelometric units (FNU) exceed the instrument calibration range. Values are included in the record but are presumed to have lower precision. Missing record due to periodic instrument malfunction. For 2016 WY (December through end of January), some specific conductivity values greater than the high-end calibration range(SC-standard solution)values were included in the record, but presume to have lower precision even though SC probe is reliable.

EXTREMES FOR PERIOD OF DAILY RECORD -

     SPECIFIC CONDUCTANCE: Maximum, 9,020 microsiemens per centimeter, January 28, 2009; minimum, 25 microsiemens per centimeter, November 06, 2018.
 
     WATER TEMPERATURE: Maximum, 33.6°C, July 23, 2011; minimum, -0.2°C, Jan. 29, 2009*.

     pH: Maximum, 10.2 standard units, on April 1,2016*; minimum, 5.2 standard units, on April 15, 2010*.

     TURBIDITY: YSI-6136 (TS087) Maximum, 1,920 formazin nephelometric units (FNU), Aug. 12, 2014; minimum, 0.0 formazin nephelometric units (FNU), on several days*.

     TURBIDITY: YSI-EXO (TS213) Maximum, 1,080 formazin nephelometric units (FNU), Aug. 12, 2020; minimum, 1.2 formazin nephelometric units (FNU), Oct. 11, 2019*.

     DISSOLVED OXYGEN: Maximum, 20.2 mg/L, March 4, 2005; minimum, 0.2 mg/L, July 11, 2019.

     * Multiple occurrences of the same extreme in selected dataset.