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Water-Year Summary for Site 14138560

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
62614 Elevation, lake/res, NGVD29(Obs.)  

Water year 2020: 2020-10-01 to 2021-09-30

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USGS Water-Year Summary 2020
LOCATION - Lat 45°27'40", long 121°50'34" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 sec.20, T.1 S., R.8 E., Multnomah County, OR, Hydrologic Unit 17080001, Mount Hood National Forest, in generator house 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.
REVISIONS HISTORY - WDR OR-95-1: 1993, 1994.
PERIOD OF RECORD - October 1992 to current year.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (Portland Water Bureau bench mark).
COOPERATION - Capacity table provided by Portland Water Bureau, extended above elevation 3,180 ft by U.S. Geological Survey, Oct. 1, 1996.
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 were constructed in 1961. Portland Water Bureau releases water from the lake to augment streamflows during periods of low flow. Month-end contents and change in contents discontinued water year 2014.
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.