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Water-Year Summary for Site 14207500

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Available Parameters
00060 Discharge(Mean)  

Water year 2020: 2020-10-01 to 2021-09-30
 

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USGS Water-Year Summary 2020
14207500 TUALATIN RIVER AT WEST LINN, OR
LOCATION - Lat 45°21'03", long 122°40'30" referenced to North American Datum of 1927, in SW 1/4 sec.34, T.2 S., R.1 E., Clackamas County, OR, Hydrologic Unit 17090010, on left bank, 300 ft upstream from bridge on State Highway 212, 0.4 mi west of West Linn city limits and at mile 1.8.
DRAINAGE AREA - 706 mi².
REVISIONS HISTORY -

WSP 1014: 1943. WSP 1184: 1947. WSP 1248: 1941. WSP 1935: Drainage area. WDR OR-75-1: 1974(M). WDR OR-77-1: 1971-73, 1975, 1976(M).

Revisions: Discharges approved and reported via NWISWeb for period Oct. 27, 2015 to May 10, 2016 have been revised.

SURFACE-WATER RECORDS
PERIOD OF RECORD - August 1928 to current year. Prior to October 1960, published as "near Willamette."
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 85.61 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers). Prior to June 12, 1941, nonrecording gage at datum 1.02 ft higher.
REMARKS - October 1951 to September 1970, records published for this station included daily flow in Oswego Canal, which diverts at a point 5.0 mi upstream from station for development of power between outlet of Lake Oswego and Willamette River. Adjustment for diversion to Lake Oswego are published for water years 1971-95. Some regulation in low-water season by flashboards on crest of diversion dam for Oswego Canal, and regulation by Henry Hagg Lake (active capacity, 53,600 acre-ft) since January 1975. Several diversions for irrigation upstream from station. Continuous water-quality records, chemical analyses, and periodic sediment data for some prior periods have been collected at this location.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 26,400 ft³/s Feb. 10, 1996, gage height, 18.32 ft, does not include an estimated 3,600 ft³/s flowing in Oswego Canal; minimum daily discharge, 0.20 ft³/s July 30 to Aug. 2, 1966.