USGS Water-Year Summary 2020
14140001 BULL RUN RIVER NEAR BULL RUN, OR
LOCATION - Lat 45°26'15", long 122°10'42" referenced to North American Datum of 1927, in NE 1/4 SW 1/4 sec.34, T.1 S., R.5 E., Clackamas County, OR, Hydrologic Unit 17080001, Mount Hood National Forest, on left bank, 1.8 mi downstream from Bull Run Reservoir Number Two, 2.7 mi northeast of Bull Run and at mile 4.7.
DRAINAGE AREA - 107 mi².
PERIOD OF RECORD - October 1959 to current year.
GAGE - Water-stage recorder. Datum of gage is 567.90 ft above NGVD of 1929 (levels by City of Portland).
COOPERATION - Records of daily diversion furnished by the City of Portland.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 25,100 ft³/s Dec. 22, 1964, from rating curve extended above 8,800 ft³/s on basis of computation of peak flow over dam; minimum daily, 11 ft³/s Nov. 16, 1987.