USGS Water-Year Summary 2021
14138720 BULL RUN RIVER AT LOWER FLUME, NEAR BRIGHTWOOD, OR
LOCATION - Lat 45°28'16", long 121°51'51" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.19, T.1 S., R.8 E., Multnomah County, OR, Hydrologic Unit 17080001, at flume, 1.0 mi downstream from outlet structure at Bull Run Lake, 10.4 mi northeast of Brightwood and at mile 20.9.
DRAINAGE AREA - 5.08 mi².
PERIOD OF RECORD - October 1992 to current year.
GAGE - Water-stage recorder. Elevation of gage is 2,840 ft above NGVD of 1929, from topographic map.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 148 ft³/s Feb. 7, 1996, gage height, 3.41 ft, from rating curve extended above 63 ft³/s on basis of slope-area measurement of peak flow; minimum discharge, 8.2 ft³/s Oct. 28, 1992.
PERIOD OF DAILY RECORD
SPECIFIC CONDUCTANCE: April 1996 to current year.
WATER TEMPERATURE: October 1995 to current year.
INSTRUMENTATION - Water-quality monitor and data logger.
EXTREMES FOR PERIOD OF DAILY RECORD
SPECIFIC CONDUCTANCE: Maximum, 40 microsiemens Nov. 16, 2005; minimum, 18 microsiemens Dec. 27, 1998.
WATER TEMPERATURE: Maximum, 9.0°C on several days during September 2000; minimum, 3.0°C Feb. 6, 1996.