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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
14209500 CLACKAMAS RIVER ABOVE THREE LYNX CREEK, OR
LOCATION - Lat 45°07'30", long 122°04'20" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.21, T.5 S., R.6 E., Clackamas County, OR, Hydrologic Unit 17090011, Mount Hood National Forest, on right bank, 0.1 mi upstream from Three Lynx Creek, 0.25 mi downstream from powerplant, 17 mi southeast of Estacada and at mile 47.8.
DRAINAGE AREA - 479 mi².
REVISIONS HISTORY - WSP 1148: Drainage area. WSP 1248: 1910(M), 1912, 1948-50(M).
SURFACE-WATER RECORDS
PERIOD OF RECORD - April 1909 to December 1913, October 1921 to current year. Prior to October 1911 monthly discharge only, published in WSP 1318.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 1,091.69 ft above NGVD of 1929 (levels by Portland General Electric Co.). Apr. 23, 1909 to Jan. 4, 1914, nonrecording gage at about same site and datum. Nov. 1, 1921 to Dec. 27, 1924, water-stage recorder at present site at datum 0.91 ft higher.
REMARKS - Regulation since May 1956 by Timothy Lake (active capacity, 64,450 acre-ft) and by Oak Grove powerhouse.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 68,200 ft³/s Dec. 22, 1964, gage height, 21.7 ft, from floodmark, from rating curve extended above 34,100 ft³/s on basis of slope-area measurement of peak flow at gage height 15.06 ft; minimum discharge recorded, 260 ft³/s Oct. 15, 2001.
