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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
12148300 SOUTH FORK TOLT RIVER BELOW REGULATING BASIN, NEAR CARNATION, WA
LOCATION - Lat 47°41'49", long 121°47'10" referenced to North American Datum of 1927, in SW 1/4 NE 1/4 sec.33, T.26 N., R.8 E., King County, WA, Hydrologic Unit 17110010, on right bank 2.3 mi upstream from mouth and 6.5 mi northeast of Carnation.
DRAINAGE AREA - 29.6 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - March 1982 to current year. Published as "South Fork Tolt River below regulating pond, near Carnation" March 1982 through September 1983.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 646.84 ft above NAVD of 1988.
REMARKS - Flow regulated by South Fork Tolt Reservoir 6.1 mi upstream since September 1963. Gage is located below City of Seattle Powerhouse discharge return. U.S. Geological Survey satellite telemeter at station. The City of Seattle Water Department diverted an average daily discharge as follows:
| Water Year | Discharge (cfs) |
Water Year | Discharge (cfs) |
Water Year | Discharge (cfs) |
Water Year | Discharge (cfs) |
| 2014 | 77 | 2015 | 72 | 2016 | 66 | 2017 | 71 |
| 2018 | 74 | 2019 | 63 | 2020 | 66 | 2021 | 75 |
EXTREMES FOR PERIOD OF RECORD - Maximum discharge not determined, Nov. 24, 1990; maximum daily discharge, 3,700 ft³/s, Nov. 24, 1990; minimum daily discharge, 36 ft³/s on many days during July and August, 1982.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD - WATER TEMPERATURE: October 1994 to current year. TURBIDITY: December 2019 to current year.
INSTRUMENTATION - Temperature recorder with 15-min. recording interval. An FTS DTS-12 turbidity sensor with 15-minute recording interval. 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, 18.9°C, July 18, 2015; minimum, 0.4°C, Dec. 22, 2022. TURBIDITY: Maximum recorded, >1600 FNU, Feb. 7, 2020, March 3, 2020, Apr. 23, 2020, and Oct. 28, 2021; minimum, 0.00 FNU, many days each year.
