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Water-Year Summary for Site 12181000

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  • 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.
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Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00060 Discharge(Mean)  
00065 Gage height(Mean)  

Water year 2024: 2024-10-01 to 2025-09-30
 
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USGS Water-Year Summary 2024
12181000 SKAGIT RIVER AT MARBLEMOUNT, WA
LOCATION - Lat 48°32'02", long 121°25'43" referenced to North American Datum of 1927, in NE 1/4 SW 1/4 sec.07, T.35 N., R.11 E., Skagit County, WA, Hydrologic Unit 17110005, on right bank 0.5 mi north of Marblemount, 0.6 mi upstream from Cascade River, and at mile 78.7.
DRAINAGE AREA - 1,381 mi². of which 400 mi² are in Canada.
REVISIONS HISTORY - WDR WA-76-1: Drainage area. WDR WA-90-1: 1983, 1976-87 (M).
SURFACE-WATER RECORDS
PERIOD OF RECORD - September 1943 to July 1944, October 1946 to September 1951, and annual maximum, water years 1952-57. May 1976 to current year.
GAGE - Datum of gage is 305.1 ft above NGVD of 1929 (river-profile survey) and 308.64 ft above NAVD of 1988 (USGS differential level survey from WSDOT benchmark, Oct. 2020).
REMARKS - All diversions returned to river upstream from gage. Flow regulated by Ross Reservoir (station 12175000), Diablo Reservoir (station 12176500), and Gorge Reservoir (station 12177700) since 1960. U.S. Geological Survey satellite telemeter at station. 
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 64,800 ft³/s, Oct. 20, 2003, gage height, 14.11 ft, from rating curve extended above 30,000 ft³/s; minimum daily discharge, 1,190 ft³/s, Feb. 25, 1944.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD - WATER TEMPERATURE: March 1986 to current year.
INSTRUMENTATION - Water-temperature sensor with 15-minute logging interval, interfaced directly with a data collection platform for satellite telemetry.
REMARKS - U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 16.3°C, Aug. 27, 2015 and Aug. 17, 2023; minimum, 0.7°C, Dec. 27, 1996.