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Water-Year Summary for Site 14140000

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
00060 Discharge(Mean)  

Water year 2019: 2019-10-01 to 2020-09-30

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USGS Water-Year Summary 2019
LOCATION - Lat 45°26'14.28", long 122°10'46.76" referenced to North American Datum of 1983, in NE 1/4 SW 1/4 sec.34, T.1 S., R.5 E., Clackamas County, OR, Hydrologic Unit 17080001, in 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.
REVISIONS HISTORY - WSP 1288: 1910-11, 1913, 1920-23, 1926, 1929. WSP 1318: 1919(M). WSP 1568: 1952. See also PERIOD OF RECORD.
PERIOD OF RECORD - September 1907 to current year. Records for water years 1960-76, included diversions, have been reduced to river only. Records for January 1895 to August 1907, published in WSP 370, have been found to be unreliable and should not be used.
GAGE - Water-stage recorder. Datum of gage is 567.90 ft above NGVD of 1929 (levels by City of Portland). Prior to July 27, 1909, nonrecording gage at site 1.5 mi upstream at different datum. July 27, 1909 to Sept. 30, 1959, water-stage recorder at site 2.5 mi upstream at different datum.
REMARKS - Flow regulated since 1915 by Bull Run Lake (capacity, 12,270 acre-ft), since 1929 by Bull Run Reservoir Number One (capacity, 30,140 acre-ft), since 1958 by North Fork Reservoir (capacity, 1,030 acre-ft), and since 1961 by Bull Run Reservoir Number Two (capacity, 21,000 acre-ft). Computation of monthly and annual adjusted flows discontinued water year 1959 (see PERIOD OF RECORD). Continuous water-quality records for period December 2000 to September 2006 have been collected at this location.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 24,800 ft³/s Dec. 22, 1964, gage height, 17.21 ft, from rating curve extended above 8,800 ft³/s on basis of computation of peak flow over dam; minimum discharge, 1.1 ft³/s Oct. 4, 1974.