LOCATION.--Lat 41°26'28.9", long 74°36'06.8" referenced to North American Datum of 1983, Orange County, NY, Hydrologic Unit 02040104, on right bank just upstream from bridge on Guymard Turnpike, 0.5 mi downstream from Basher Kill, 0.8 mi southeast of Godeffroy, 1.7 mi south of Cuddebackville, and 8.5 mi upstream from mouth.
DRAINAGE AREA.--307 mi².
PERIOD OF RECORD.--Gage heights and discharge measurements, August to October 1903 and August 1909 to April 1914, and twice-daily figures of discharge for January 1911 to December 1912 (which do not represent daily mean discharges because of diurnal fluctuation) are published in WSP 97, 261, 321, 351, and 381. July 1937 to current year. August to October 1903, published as "Navesink River at Godeffroy, NY."
REVISIONS HISTORY.--WSP 1502: 1951(M). WDR NY-82-1: Drainage area. WDR NY-87-1: 1986. WDR-US-2007: 2006.
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 459.66 ft above NGVD of 1929 (levels by Corps of Engineers) and 458.86 ft above NAVD of 1988. Prior to Apr. 30, 1914, nonrecording gages at same site (August to October 1903 at datum 0.98 ft higher).
REMARKS.--Prior to 1949, diurnal fluctuation at low and medium flow caused by powerplant at Cuddebackville. Subsequent to June 1953, entire flow from 92.5 mi² of drainage area controlled by Neversink Reservoir (station 01435900). Part of flow diverted for New York City municipal supply. Remainder of flow (except for conservation releases and spill) impounded for release during periods of low flow in the lower Delaware River basin, as directed by the Delaware River Master. Occasional regulation by Pleasure Lake at South Fallsburg.
Water Years 2014-23: Records good except those for estimated daily discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, since construction of Neversink Reservoir in 1953, 33,000 ft³/s, Aug. 19, 1955, gage height, 12.49 ft; minimum discharge not determined.
EXTREMES FOR PERIOD PRIOR TO REGULATION.--Maximum discharge, prior to construction of Neversink Reservoir in 1953, 24,500 ft³/s, Nov. 26, 1950, gage height, 11.79 ft; minimum observed, no flow July 21, 22, 28, 1911, result of regulation.
PERIOD OF DAILY RECORD¹.--WATER TEMPERATURE: October 2018 to current year. SPECIFIC CONDUCTANCE: January 2020 to current year.
INSTRUMENTATION¹.--A continuous water-quality monitor with water temperature and specific conductance provides 15-minute-interval readings.
EXTREMES FOR PERIOD OF DAILY RECORD¹.--WATER TEMPERATURE: Maximum, 28.2°C, June 30, 2021; minimum, -0.2°C on several days during 2019 winter period. SPECIFIC CONDUCTANCE: Maximum, 331 uS/cm at 25 °C, Feb. 18, 2021; minimum, 44 uS/cm at 25 °C, July 18, 2021.
¹ Water-Quality Records

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