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Water-Year Summary for Site 12148000

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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)  
00020 Temperature, air(Min.,Mean,Max.)  
00060 Discharge(Mean)  
00065 Gage height(Mean)  
63680 Turbidity, Form Neph(Max.,Med.,Min.)  

Water year 2023: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2023
LOCATION - Lat 47°41'22", long 121°42'44" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.31, T.26 N., R.9 E., King County, WA, Hydrologic Unit 17110010, on left bank 0.1 mi upstream from private road bridge, 1.6 mi downstream from South Fork Tolt Reservoir, 9.8 mi northeast of Carnation, and at mile 6.8.
DRAINAGE AREA - 19.7 mi².
REVISIONS HISTORY - 2016 (M), 2017 (M).
PERIOD OF RECORD - October 1952 to December 1963, June 1969 to current year.
GAGE - Water-stage recorder. Elevation of gage is 1,300 ft above NGVD of 1929, from river-profile map.
REMARKS - Regulation by South Fork Tolt Reservoir since September 1963. Seattle Public Utilities diverts streamflow upstream from the station. U.S. Geological Survey satellite telemeter at station. The City of Seattle Water Department diverted an average daily discharge as follows:
   Water Year       Discharge   
   Water Year        Discharge   
   Water Year       Discharge   
   Water Year       Discharge   
2014 77  2015 72 2016 66 2017 71  
 2018 74 2019  63 2020  66  2021  75 
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 6,500 ft³/s, Dec. 15, 1959, gage height, 7.45 ft, from rating curve extended above 2,700 ft³/s; maximum gage height, 7.62 ft, Nov. 20, 1958, backwater from debris; minimum discharge, 8.4 ft³/s, Sept. 12, 1963, minimum gage height, 0.81 ft, Aug. 23-27, 1958.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: October 1994 to current year. TURBIDITY: December 2019 to current year.
INSTRUMENTATION - Temperature recorder with 15-min. logging interval, since October 1994. DTS-12 turbidity sensor with a 15-minute logging interval, since December 2019.  Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.  
REMARKS - U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum recorded, 18.1°C, Sept. 5, 2003; minimum, 1.2°C, Feb. 14, 2021. TURBIDITY: Maximum recorded, 245 FNU, Feb. 22, 2021; minimum, 0.1 FNU, July 26 and Aug. 1, 2020.