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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
12148500 TOLT RIVER NEAR CARNATION, WA
LOCATION - Lat 47°41'45", long 121°49'22" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.31, T.26 N., R.8 E., King County, WA, Hydrologic Unit 17110010, on right bank 500 ft downstream from the forks, 0.4 mi upstream from Stossel Creek, 5.5 mi northeast of Carnation, and at mile 8.7.
DRAINAGE AREA - 81.4 mi².
REVISIONS HISTORY - WSP 1286: 1929(M), 1930, 1938(M), 1939, 1943(M), 1945(M), 1951(M). WSP 1932: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - August 1928 to January 1932, September 1937 to current year. Prior to October 1951, published as "near Tolt."
GAGE - Water-stage recorder. Elevation of gage is 348 ft above NGVD of 1929 (river-profile survey). Prior to Oct. 31, 1928, nonrecording gage, and Oct. 31, 1928, to Jan. 3, 1932, water-stage recorder at site 350 ft upstream at datum 7.1 ft higher (river-profile survey). Sept. 1 to Oct. 6, 1937, nonrecording gage at present site at datum 1.64 ft higher.
REMARKS - Some regulation by South Fork Reservoir, capacity, 57,830 acre-ft, and by Seattle City Light hydroelectric project, upstream from station. Chemical analyses July 1960 to September 1970. 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, 17,400 ft³/s, Dec. 15, 1959, gage height, 13.04 ft; minimum daily discharge, 53 ft³/s, Sept. 22, 23, 1951.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD - WATER-TEMPERATURE: October 2016 to present.
REMARKS - U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - WATER TEMPERATURE: Maximum recorded, 17.5°C, Aug. 15, 2023; minimum, 1.2°C, Dec. 22, 2022.
