USGS Water-Year Summary for Site 12061500

Click to hide Water-Year Summary instructions and information

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
	00060 Discharge(Mean)
	00065 Gage height(Mean)

Select a water year

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

Print this page

USGS Water-Year Summary 2020

12061500 SKOKOMISH RIVER NEAR POTLATCH, WA

LOCATION - Lat 47°18'36", long 123°10'33" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 sec.15, T.21 N., R.4 W., Mason County, WA, Hydrologic Unit 17110017, on upstream side of bridge on U.S. Highway 101, 3.7 mi downstream from confluence of North and South Forks, 4.7 mi southwest of Potlatch, and at mile 5.3.

DRAINAGE AREA - 227 mi². including 97.9 mi² (revised) upstream from Cushman Dam No. 2, which is noncontributing except during spillage.

REVISIONS HISTORY - WSP 1716: 1950(M), 1956. WSP 1932: Drainage area. WDR WA-72: 1968(M), 1971(M). WDR WA-75: 1974, 2012.

SURFACE-WATER RECORDS

PERIOD OF RECORD - July 1943 to current year. TURBIDITY: November 2011 to September 2012.

GAGE - Water-stage recorder. Datum of gage is 10.52 ft above NGVD of 1929. Prior to May 27, 1964, water-stage recorders or nonrecording gage at several sites about 0.6 mi upstream at different datums. Supplementary water-stage recorder on right bank at site 0.6 mi upstream at datum 16.47 ft above NGVD of 1929 used Nov. 16 to Dec. 10, 1964, June 11 to July 7, and Nov. 2-24, 1965.

REMARKS - Flow partly regulated at Lake Cushman and Cushman Reservoir No. 2. In normal years, about half of the flow of North Fork is diverted at Cushman Dam No. 2 and is discharged into Hood Canal through Cushman powerplant No. 2. Chemical analyses August 1960 to September 1961, October 1961 to September 1970 (partial-record station), October 1971 to September 1974. Water temperature May 1955 to September 1962, October 1963 to September 1982. Water temperature and specific conductance July 1996 to April 1998. U.S. Geological Survey satellite telemeter at station. Due to bank overflow, discharges above 16.40 ft gage height cannot be determined by direct methods.

Water Year 2014: No estimated daily discharges. Records fair.

Water Years 2015, 2016: Records fair except for estimated daily discharges, which are poor.

Water Years 2017, 2018 and 2020: No estimated discharges. Records fair.

Water Year 2019: Records fair except for estimated discharges, which are poor.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of December 1933 reached an elevation of 30.8 ft above NGVD of 1929 at site on left bank 150 ft upstream from old highway bridge, discharge, 18,600 ft³/s.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 36,600 ft³/s, Nov. 23, 1990, gage height, 16.80 ft (floodmark), from rating curve extended above 14,000 ft³/s; maximum gage height, 18.16 ft, Dec. 3, 2007; minimum discharge, 99 ft³/s, Oct. 27, 28, Nov. 6-9, 1987.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - TURBIDITY: November 2011 to September 2012 (discontinued).

INSTRUMENTATION - Turbidity sensor (FTS DTS-12) interfaced with a Data Collection Platform/Electronic Datalogger, with 15-minute recording interval, since November 2011. 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 - Turbidity records are fair to poor.

EXTREMES FOR PERIOD OF DAILY RECORD - TURBIDITY: Maximum, 576 FNU, Nov. 23, 2011; minimum, 0.0 FNU on several days in August and September 2012.