LOCATION.--Lat 40°40'38", long 73°30'56" referenced to North American Datum of 1983, Nassau County, NY, Hydrologic Unit 02030202, 500 ft south of intersection of Valentine Place and Old Mill Road, in Bellmore, 0.5 mi north of Sunrise Highway, and 0.5 mi northwest of Wantagh.
DRAINAGE AREA.--14.24 mi².
PERIOD OF RECORD.--June to October 1883 (fragmentary), July to October 1903, published in Professional Paper 44, September 1937 to March 2000, October 2005 to September 2010, October 2012 to September 2013, October 2015 to current year. Prior to October 1957 published as Wantagh Stream at Wantagh. October 1957 to October 1967, published as Wantagh Stream at Bellmore.
REVISIONS HISTORY.--WDR NY-09-2: Drainage area.
GAGE.--There is no gage. Since November 1955, daily discharge is calculated based on records for base gage (01309950) and supplementary gage (01309990). Base gage (01309950): Water-stage recorder. Concrete control since July 24, 1974. June to October 1883, determination of flow by various methods at different site and datum. July to October 1903, nonrecording gages on two channels near present site at different datum. Sept. 23, 1937, to Aug. 1, 1958, water-stage recorder with concrete control on right bank of present secondary channel about 1,000 ft east at datum 1.88 ft higher (used as supplementary gage since Aug. 1, 1958). Supplementary gage (01309990): Water-stage recorder with concrete control on right bank of secondary channel about 1,000 ft east of base gage.
REMARKS.--Prior to Nov. 4, 1955, flow at all stages regulated intermittently at outlet of Wantagh Reservoir, 1.0 mi above station, and prior to November 1953 by Browning Pond, 0.5 mi above station. Subsequent to Nov. 3, 1955, permanent diversion of a substantial portion of the flow through west branch of Bellmore Creek. Discharge figures given are those of combined flows to main and secondary channels.
Water Years 2016-22: Records fair except those for estimated daily discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Extremes prior to 1937 not included. Maximum discharge prior to beginning of diversion in November 1955, 340 ft³/s, June 1, 1952, adjusted to include flow bypassing station; maximum gage height, 2.57 ft, June 1, 1952, datum then in use; maximum daily discharge since beginning of diversion in November 1955, 162 ft³/s, Sept. 12, 1960; minimum, no flow July 24, 25, 1986, Aug. 11 to Sept. 16, 19-21, 1995, and many days July to Sept. 1999.

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