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LOCATION.--Lat
41°22'14", long 74°41'51" referenced to North
American Datum of 1983, Pike County, PA, Hydrologic Unit 02040104, on
right bank 250 ft downstream from bridge on U.S. Highways 6 and 209
between Port Jervis, NY and Matamoras, PA, 1.2 mi upstream from
Neversink River, and 6.5 mi downstream from Mongaup River.
DRAINAGE AREA.--3,070 mi².
PERIOD OF RECORD.--October 1904 to current year.
REVISIONS HISTORY.--WSP 1031: 1905-36. WDR NY-71-1: 1970. WDR
NY-82-1: Drainage area. WDR NY-86-1: 1979-80. WDR NY-04-1: 2003.
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage
is 415.35 ft above NGVD of 1929 and 414.71 ft above NAVD of 1988. Prior
to Aug. 14, 1928, nonrecording gage at bridge 250 ft upstream at same
datum; operated by U.S. Weather Service prior to June 20, 1914.
REMARKS.--Flow regulated by Prompton Reservoir (station
01428900), General Edgar Jadwin Reservoir (station 01429400), Lake
Wallenpaupack (station 01431700), Toronto Reservoir (station 01433100),
Cliff Lake (station 01433200), Swinging Bridge Reservoir (station
01433000), and smaller reservoirs. Large diurnal fluctuations at medium
and low flows caused by powerplants on tributary streams. Subsequent to
September 1954, entire flow from 371 mi² of drainage area controlled by
Pepacton Reservoir (station 01416900), and subsequent to October 1963,
entire flow from 454 mi² of drainage area controlled by Cannonsville
Reservoir (station 01424997). Part of flow from these reservoirs
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.
Water Years 2014-18: Records good except those for estimated daily
discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge prior to
current degree of regulation, 233,000 ft³/s, Aug. 19, 1955, gage
height, 23.91 ft, from floodmarks in gage house, outside gage height
was 24.16 ft, from floodmark, from rating curve extended above 130,000
ft³/s, on basis of slope-area measurement of peak flow; maximum
discharge since current degree of regulation, 189,000 ft³/s, June 28,
2006, gage height, 21.47 ft, outside gage height was 22.16 ft, from
crest-stage gage; maximum gage height, 26.6 ft, Feb. 12, 1981 (ice
jam), from floodmarks; minimum observed discharge, 175 ft³/s, Sept. 23,
1908, gage height, 0.6 ft.
EXTREMES OUTSIDE PERIOD OF RECORD.--The U.S. Weather Bureau
reported a discharge of 205,000 ft³/s, Oct. 10, 1903, gage height, 23.1
ft, from rating curve extended above 70,000 ft³/s, by velocity-area
studies; maximum gage height, 25.5 ft, Mar. 8, 1904 (ice jam).
PERIOD OF DAILY RECORD1.--
SPECIFIC CONDUCTANCE: January to September 1973.
WATER TEMPERATURE: February 1957 to September 1960, January to
September 1973, June 1974 to January 1994, October 1998 to August
2001.
SUSPENDED-SEDIMENT DISCHARGE: February 1957 to September 1960, March
1970 to June 1976.
REMARKS1.--Interruptions of daily record were due to
malfunction of recording instrument.
EXTREMES FOR PERIOD OF DAILY RECORD1.--
WATER TEMPERATURE: Maximum (water years 1957-59, 1973-81, 1983-84,
1988-93, 1999-2000), 30.5°C, July 5, 1999; minimum (water years
1958-60, 1973, 1975-93, 1999),0.0°C on many days during winter periods,
except 1984.
SUSPENDED-SEDIMENT CONCENTRATION (water years 1957-60, 1970-76):
Maximum daily mean, 760 mg/L, June 29, 1973; minimum daily mean, less
than 1 mg/L on many days.
SUSPENDED-SEDIMENT DISCHARGE (water years 1957-60, 1970-76): Maximum
daily, 187,000 tons, June 29, 1973; minimum daily, 1 ton, Aug. 29,
1957.
1 Water-Quality Records
Peak Flow and Stage Information
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