Warning: Javascript must be enabled to use all the features on this page!

Page Loading - Please Wait...

Click to hideNews Bulletins
Click to hide state-specific text



Click to hidestation-specific text

This station is operated in cooperation with:
   Green Island Power Authority
   NYS Department of Environmental Conservation

LOCATION.--Lat 42°45'08", long 73°41'20" referenced to North American Datum of 1983, Albany County, NY, Hydrologic Unit 02020003, on right bank at Green Island, just upstream from Troy Lock and Dam, and 0.5 mi downstream from 5th branch Mohawk River.
DRAINAGE AREA.--8,090 mi2, approximately (including that above site of former auxiliary gage).
PERIOD OF RECORD.--February 1946 to current year (October 1997 to September 2000, discharges only for days when inflatable rubber dam was considered to have been collapsed; see REMARKS).
GAGE.--Water-stage recorder. Datum of gage is 0.31 ft below NGVD of 1929 (Corps of Engineers benchmark). From July 1, 1946 to Mar. 12, 1962, auxiliary water-stage recorder on bypass channel at datum 10.59 ft higher. Power transducer on each turbine in powerplant. Since Oct. 1, 2008, auxiliary acoustic velocity meter about 1,600 ft upstream from base gage.
REMARKS.--Records good except those for estimated daily discharges, which are poor. Records include flow over spillway, flow through lock, and flow through powerplant. Powerplant, located on the right bank just downstream from gage, was inoperative from Nov. 20, 1960 to Feb. 23, 1971. An inflatable rubber dam was installed on the spillway during August 1991. August 1991 through September 1997, and since October 2000, estimated water-discharge data based on records for Hudson River above Lock 1 near Waterford (station 01335754) and Mohawk River at Cohoes (station 01357500) due to inflatable rubber dam. October 1997 to September 2000, discharges only for days when inflatable rubber dam was considered to have been collapsed. Satellite gage-height and power transducer telemeter readings at station.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 181,000 ft3/s, Dec. 31, 1948, Aug. 29, 2011, gage height, 27.05 ft; minimum discharge not determined; minimum gage height, 13.68 ft, July 6, 1981, when pool was lowered for inspection of flashboards.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Mar. 19, 1936, reached a stage of 29.48 ft at gage on opposite bank, from information by Corps of Engineers (discharge, 215,000 ft3/s). Flood of Mar. 28, 1913, prior to construction of Sacandaga Reservoir and Troy lock and dam, reached a stage about 0.2 ft higher upstream from former dam near same site. Downstream from dams, flood in 1913 was about 3.3 ft higher than flood in 1936, from information by Corps of Engineers.
Derived from NY Annual Water-Data Report 2013

Peak Flow and Stage Information
This station managed by the NY Water Science Center, Troy.

Available Parameters Available Period
All 2 Available Parameters for this site
00065 Gage height 2014-11-03  2015-03-03
00060 Discharge 2014-11-03  2015-03-03

Graph w/ stats
Graph w/o stats
Graph w/ (up to 3) parms
Days  (7)

  -- or --
Begin date

End date

Summary of all available data for this site
Instantaneous-data availability statement

Gage height, feet

Most recent instantaneous value: 15.09   03-03-2015  18:15 EST
Graph of  Gage height, feet

Add up to 2 more sites and replot for "Gage height, feet"

 Add site numbers

Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

Discharge, cubic feet per second
-- Data temporarily unavailable for the time period specified --