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USGS Water-Year Summary 2024
14137000 SANDY RIVER NEAR MARMOT, OR
LOCATION - Lat 45°23'59", long 122°08'10" referenced to North American Datum of 1927, in NW 1/4 sec.18, T.2 S., R.6 E., Clackamas County, OR, Hydrologic Unit 17080001, on right bank, 0.6 mi west/northwest of Marmot, 7.7 mi downstream from Salmon River and at mile 29.8.
DRAINAGE AREA - 264 mi².
REVISIONS HISTORY - WSP 594: Drainage area. WSP 1288: 1912(M), 1915, 1922, 1924, 1934(M). WSP 1318: 1932(M), WDR OR-97-1: Drainage Area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - August 1911 to current year. Monthly discharge only, January to September 1916, October 1918 to June 1919, published in WSP 1318. Published as "at Marmot" October 1912 to September 1913. Records for January 1916 to June 1919, published as "below dam, near Marmot," obtained by combining records for Sandy River below dam, near Marmot, with records for Sandy River Canal near Marmot. Records for Oct. 1, 2002 to Oct. 18, 2007, obtained by combining records for Sandy River Diversion above Marmot Dam (14137001) with records for Sandy River below Marmot Dam, near Marmot (14137002).
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is NGVD of 1929 (levels by Portland General Electric Co.). Aug. 15, 1911 to Dec. 20, 1915 and July 2, 1919 to Oct. 19, 1933, nonrecording gage at site 1.5 mi upstream at different datum. Oct. 20, 1933 to Sept. 30, 1958, water-stage recorder at site 1.1 mi upstream at different datum. Oct. 1, 1958 to Mar. 10, 1997, water-stage recorder at site 0.6 mi upstream at different datum. Mar. 11, 1997 to Sept. 30, 2002, water-stage recorder at site 0.5 mi upstream at same datum.
REMARKS - No regulation or diversion upstream from station. Precipitation records for period October 2009 to September 2012 have been collected at this location.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 61,400 ft³/s Dec. 22, 1964, gage height, 17.05 ft, site and datum then in use, from rating curve extended above 7,000 ft³/s; maximum gage height, 20.40 ft, Feb. 7, 1996, site and datum then in use; minimum discharge, 190 ft³/s Oct. 13, 1994.
