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Water-Year Summary for Site 12147600

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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)  
00065 Gage height(Mean)  

Water year 2019: 2019-10-01 to 2020-09-30
 

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USGS Water-Year Summary 2019
12147600 SOUTH FORK TOLT RIVER NEAR INDEX, WA
LOCATION - Lat 47°42'25", long 121°35'56" referenced to North American Datum of 1927, in NE 1/4 SW 1/4 sec.25, T.26 N., R.9 E., King County, WA, Hydrologic Unit 17110010, on left bank 0.6 mi upstream from Phelps Creek, 8.1 mi south of Index, and at mile 12.9.
DRAINAGE AREA - 5.34 mi².
REVISIONS HISTORY - WDR WA-02-1: 1999-2000(P).
SURFACE-WATER RECORDS
PERIOD OF RECORD - December 1959 to December 1963, November 1967 to current year.
GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 1,850 ft above NGVD of 1929, from topographic map. Prior to Oct. 1, 1961, at datum 0.85 ft higher. Oct. 1, 1961, to Sept. 30, 1992, at datum 1.00 ft higher.
REMARKS - No regulation or diversion upstream from station. A portion of flow is within the gravel streambed and is unmeasurable. U.S. Geological Survey satellite telemeter at station.
  • Water Year 2014: Records fair except for those above 900 ft³/s and estimated discharges, which are poor.
  • Water Years 2015-2016: No estimated daily discharges. Records fair except for those above 500 ft³/s, which are poor.
  • Water Year 2017-2018: Records fair except for those above 500 ft³/s and estimated discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 2,240 ft³/s, Dec. 15, 1999; gage height, 4.54 ft, possible result from debris dam break up; maximum gage height, 8.13 ft, present datum, Dec. 14, 1959; minimum discharge, 2.2 ft³/s, Oct. 9, 10, 1989, Sept. 9, 10, 1997, Sept. 14-17, 1998.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD - Water-temperature: October 1994 to current year.
INSTRUMENTATION - Temperature recorder since October 1994, with a 15-minute logging interval.
REMARKS -
  • Water Year 2014: WATER TEMPERATURE records excellent.
  • Water Year 2015: WATER TEMPERATURE records excellent except Jan. 12-23, which are good and Jan. 24 to April 14, which are fair.
  • Water Year 2016: WATER TEMPERATURE records excellent. No Record Nov. 1-5.
  • Water Year 2017: WATER TEMPERATURE records excellent. No record May 6-9.
  • Water Year 2018: WATER TEMPERATURE records excellent.
EXTREMES FOR PERIOD OF RECORD - Water-temperature: Maximum, 18.9°C, July 2-3, 2015; minimum recorded, 0.0°C, at times during most winter periods.