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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
12149000 SNOQUALMIE RIVER NEAR CARNATION, WA
LOCATION - Lat 47°39'58", long 121°55'27" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.09, T.25 N., R.7 E., King County, WA, Hydrologic Unit 17110010, on left bank 40 ft downstream from highway bridge, 1.3 mi northwest of Carnation, 1.9 mi downstream from Tolt River, and at mile 23.0.
DRAINAGE AREA - 603 mi².
REVISIONS HISTORY -
WSP 1316: 1932-33(M). WSP 1446: 1934(M). WSP 1932: Drainage area.
The datum at the gage reported starting May 21, 2021 was corrected on March 3, 2022, based on review of the 2020 NAVD88 survey and further review of previously reported datums.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1928 to current year. Monthly discharge only for October 1928 to February 1929, published in WSP 870. Prior to October 1951, published as "near Tolt."
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 and 2.12 ft above NAVD 88 (USGS GNSS Level 2 Survey, Sept 2020). Prior to Dec. 20, 1933, nonrecording gage on old bridge, 100 ft upstream and Dec. 20, 1933, to Sept. 30, 1939, water-stage recorder at present site, at datum 42.96 ft higher.
REMARKS - Several small diversions for irrigation and domestic use upstream from station. Low flow diverted for operation of powerplant at Snoqualmie Falls but returned to river upstream from station. Some pondage at Snoqualmie Falls and some diurnal fluctuation caused by powerplant. Chemical analyses October 1966 to June 1969. Water temperatures October 1966 to June 1969. 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, 82,900 ft³/s, Jan. 8, 2009, gage height, 62.21 ft.; minimum daily discharge, 341 ft³/s, Sept. 15, 1973.
