PROVISIONAL DATA SUBJECT TO REVISION

Station operated in cooperation with Portland Water Bureau.

[Bull Run Lake] - Photo provided by the Portland Water Bureau.

STATION.-- 14138560 BULL RUN LAKE NEAR BRIGHTWOOD, OR
LOCATION.--Lat 45° 27'39", long 121° 50'34", in SE 1/4 SE 1/4 sec.20, T.1 S., R.8 E., Multnomah 
County, Hydrologic Unit 17080001, in Mount Hood National Forest, in main cabin on 
northwest side of Bull Run Lake, near outlet structure, 10.7 mi northeast of Brightwood, 
and at mile 21.9.
DRAINAGE AREA.--3.5 mi2.
PERIOD OF RECORD.--October 1992 to current year.
REVISED RECORDS.--WDR- OR-95-1:  1993, 1994.
GAGE.--Water-stage recorder. Add 3100 ft. to stage readings to correct to mean NGVD of 1929. 
REMARKS.--Bull Run Lake was formed by natural processes, including a large landslide. A 
temporary log crib dam was constructed in 1917 to increase the capacity of the lake. In 
1920 the log  crib dam was reconstructed. A concrete dam and improved outlet valve were 
constructed in 1958.  
A lower outlet and tunnel was constructed in 1961. Portland Water Bureau releases water from the 
lake to augment streamflows during periods of low flow. For additional information refer to USGS 
Water Resources Investigation Report 96-4064.
COOPERATION.--Capacity table provided by Portland Water Bureau, extended above 3,180 feet by 
U.S. Geological Survey, Oct. 1, 1996.
EXTREMES FOR PERIOD OF RECORD.--Maximum contents, 48,340 acre-ft Feb. 9, 1996, 
elevation, 3,185.02 ft; minimum contents observed, 31,080 acre-ft Oct. 29, 1992, 
elevation, 3,143.97 ft.

                Capacity Table (elevation, in feet and contents, in acre-feet)
                                          

                         2,905       0   3,140   29,510
                         2,940     229   3,150   33,410
                         2,980   1,270   3,160   37,380
                         3,020   3,740   3,180   46,080
                         3,060   8,880   3,186   48,780
                         3,100  17,280