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Water-Year Summary for Site 12178000

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00060 Discharge(Mean)  

Water year 2018: 2017-10-01 to 2018-09-30

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USGS Water-Year Summary 2018
LOCATION - Lat 48°40'19", long 121°14'42" referenced to North American Datum of 1927, in SW 1/4 SE 1/4 sec.21, T.37 N., R.12 E., Whatcom County, WA, Hydrologic Unit 17110005, Ross Lake National Recreation Area, on right bank 0.4 mi upstream from Newhalem Creek, 0.5 mi downstream from City of Seattle power plant at Newhalem, 10.8 mi upstream from Bacon Creek, and at mile 93.7.
DRAINAGE AREA - 1,175 mi². of which 400 mi² are in Canada.
REVISIONS HISTORY - WSP 512: 1909-14. WSP 1012: 1929. WSP 1316: 1914(M). WSP 1932: Drainage area.
PERIOD OF RECORD - October 1908 to May 1914, October 1920 to current year. June 1914 to September 1920 (monthly discharge only), in State Water-Supply Bulletin 6. Published as "near Marblemount" 1908-14, 1920-31.
GAGE - Water-stage recorder. Datum of gage is 401.5 ft above NGVD of 1929 (river-profile survey). Prior to May 24, 1914, non-recording gages at site 0.5 mi upstream at datum 91 ft higher. Nov. 15, 1920, to June 4, 1923, non-recording gage at site about 500 ft upstream at same datum.
REMARKS - Water is diverted 2.9 mi upstream from station and is returned to river at City of Seattle powerplant 0.5 mi upstream from station. Flow regulated by Gorge powerplant since August 1924 and by Ross Reservoir (station 12175000) since March 1940, Diablo Reservoir (station 12176500) since October 1929, and Gorge Reservoir (station 12177700) since June 1960, having a combined total capacity of 1,533,000 acre-ft. U.S. Geological Survey satellite telemeter at station. Chemical analyses October 1973 to September 1974.
  • Water Year 2014 and 2015: No estimated daily discharges. Records good.
  • Water Year 2016: No estimated daily discharges. Records fair.
  • Water Year 2017: No estimated discharges. Records good.
  • Water Year 2018: No estimated discharges. Records good.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of 1815 reached a stage of approximately 20.5 ft, discharge about 115,000 ft³/s. Records for other floods, prior to establishment of station, are given in WSP 1527.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 63,500 ft³/s, Nov. 29, 1909, gage height, 22.0 ft, from flood mark, site and datum then in use; minimum discharge, 54 ft³/s, Nov. 1, 1943, gage height, 78.15 ft; minimum daily discharge, 136 ft³/s, Aug. 24, 1930.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: January 1999 to current year.
INSTRUMENTATION - Water-temperature sensor with a 15-minute logging interval, interfaced with a data collection platform for satellite telemetry.
  • Water Year 2014: Water-temperature records good.
  • Water Year 2015-2018: Water-temperature records excellent.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum recorded, 15.4°C, Aug. 29, 2015; minimum, 2.2°C, Feb. 21, 2002.