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USGS Water-Year Summary 2024
14139000 BULL RUN RESERVOIR NUMBER ONE NEAR BULL RUN, OR
LOCATION - Lat 45°28'58", long 122°04'56" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.16, T.1 S., R.6 E., Multnomah County, OR, Hydrologic Unit 17080001, Mount Hood National Forest, in control house of Bear Creek Dam on Bull Run River, 8.2 mi northeast of Bull Run and at mile 11.2.
DRAINAGE AREA - 74.6 mi².
REVISIONS HISTORY - WSP 814: 1935(M). WSP 1935: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1928 to current year. Prior to October 1937, published as Bull Run Reservoir. October 1937 to September 1967, published as Lake Ben Morrow. Prior to October 1975, monthend contents only.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (levels by City of Portland). Prior to Oct. 9, 1930 and Oct. 1, 1962 to Dec. 31, 1975, nonrecording gage. Oct. 9, 1930 to Sept. 30, 1962, water-stage recorder at present site and datum.
COOPERATION - Capacity table furnished by City of Portland.
REMARKS - Lake is formed by concrete dam completed in March 1929. Storage began about Apr. 29, 1929; first filling occurred May 15, 1929. Capacity, 26,930 acre-ft at crest of spillway, elevation, 1,036.0 ft. Capacity increased October 1954 to 30,140 acre-ft at elevation 1,044.0 ft, by installation of three gates, 40 ft wide and 8 ft high. No dead storage. Month-end contents and change in contents discontinued water year 2014.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 31,600 acre-ft Mar. 31, 1931, elevation, 1,047.40 ft; minimum contents observed, 169 acre-ft Jan. 10, 1960, elevation, 887.5 ft.
