Funding for this site is provided by:
LOCATION.--Lat
41°27'40.4", long 74°45'31.6" referenced to North
American Datum of 1983, Sullivan County, NY, Hydrologic Unit 02040104,
on right bank 300 ft downstream from powerplant, 0.5 mi downstream from
Bush Kill, and 2.8 mi upstream from mouth and Mongaup.
DRAINAGE AREA.--200 mi².
PERIOD OF RECORD.--August 1939 to March 1995, October 2013 to
current year.
REVISIONS HISTORY.--WDR NY-71-1: 1970. WDR NY-81-1: 1980. WDR
NY-82-1: Drainage area.
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage
is 625.05 ft above NGVD of 1929 (levels by Orange and Rockland
Utilities, Inc.) and 623.49 ft above NAVD of 1988. Prior to July 6,
1956, water-stage recorders at sites 25 ft upstream on Rio tailrace and
200 ft upstream on natural channel, at datum 4.0 ft higher.
REMARKS.--Entire flow regulated by powerplant except for runoff
from about 7 mi² of drainage area downstream from Rio Dam, and during
periods of spill from Rio Reservoir. Flow also regulated by storage in
Cliff Lake (station 01433200), Swinging Bridge Reservoir (station
01433000), and Toronto Reservoir (station 01433100) and small
reservoirs upstream from station.
Water Years 2014-18: Records fair.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 16,100 ft³/s,
Aug. 19, 1955, gage height, 11.22 ft, site and datum then in use, from
rating curve extended above 7,900 ft³/s; minimum daily, 6 ft³/s, Oct.
1, 1939, minimum instantaneous discharge not determined.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum discharge, about
10,000 ft³/s, Apr. 3, 2005, gage height, 11.9 ft, from floodmark in
gage well.
PERIOD OF DAILY RECORD1.--SPECIFIC CONDUCTANCE:
October 2013 to current year.
WATER TEMPERATURE: October 2013 to current year.
pH: October 2013 to current year.
DISSOLVED OXYGEN: October 2013 to current year.
INSTRUMENTATION1.--A continuous water-quality monitor
with water temperature, specific conductance, pH, and dissolved oxygen
provides 15-minute-interval readings.
REMARKS1.--Interruption of record was due to
malfunction of recording instrument.
EXTREMES FOR PERIOD OF DAILY RECORD1.--SPECIFIC
CONDUCTANCE: Maximum, 234 uS/cm at 25 °C, Mar. 19, 2017; minimum,
100 uS/cm at 25 °C, Dec. 3, 2018. WATER TEMPERATURE: Maximum, 24.5
°C, Sept. 25, 27, 2017; minimum, 0.5 °C, Feb. 8, 17, Mar. 1,
4, 2014. pH: Maximum, 8.8, Jan. 26, 31, 2015; minimum, 6.1, July 2,
2016. DISSOLVED OXYGEN: Maximum, 15.8 mg/L, Feb. 14, 18, 19, 22, 23,
Mar. 3, 5, 2016; minimum, 3.3 mg/L, Sept. 22, 2015.
1 Water-Quality Records
Peak Flow and Stage Information
Station image