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USGS Water-Year Summary 2024
14200000 MOLALLA RIVER NEAR CANBY, OR
LOCATION - Lat 45°14'40", long 122°41'10" referenced to North American Datum of 1927, in NW 1/4 NE 1/4 sec.09, T.4 S., R.1 E., Clackamas County, OR, Hydrologic Unit 17090009, on left bank, at upstream side of Goods Bridge, 1.5 mi south of Canby and at mile 6.01.
DRAINAGE AREA - 323 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - August 1928 to September 1959, October 1963 to September 1978, October 2000 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 97.49 ft above NAVD of 1988 determined by GNSS Level II survey. Prior to Oct. 24, 1933, nonrecording gage, and Oct. 24, 1933 to Sept. 26, 1955, water-stage recorder at present site at datum 11.00 ft higher. Sept. 27, 1955 to June 3, 1956, water-stage recorder at site 145 ft downstream at datum 10 ft higher. June 4, 1956 to Sept. 30, 1959, water-stage recorder at site 0.3 mi downstream at datum 8.02 ft higher. Oct. 1, 1963 to May 4, 1964, nonrecording gage, and May 5, 1964 to Sept. 30, 1978, Oct. 1, 2000 to Oct. 31, 2001, water-stage recorder at present site at datum 10 ft higher.
REMARKS - No regulation. Numerous small diversions for irrigation upstream from station. Precipitation records for period January 2010 to September 2013 have been collected at this location.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 43,600 ft³/s Dec. 22, 1964, gage height, 26.76 ft, present datum; minimum discharge, 20 ft³/s Aug. 24, 1959.
