USGS Water-Year Summary 2023
12148000 SOUTH FORK TOLT RIVER NEAR CARNATION, WA
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.
- 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.
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.
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.