South Fork Bull Run River
Introduction The '''South Fork Bull Run River''' is a tributary, about  long, of the Bull Run River in the U.S. state of Oregon. Part of the system that provides drinking water to the city of Portland, it flows generally west through a protected part of the Mount Hood National Forest in Clackamas County. It joins the Bull Run River at Bull Run Reservoir 2, about  from the larger stream's confluence with the Sandy River.
Course The river, which begins in Township Meadow in the Mount Hood National Forest, flows northwest and then west through Clackamas County and the Mount Hood National Forest. It receives its only named tributary, Cedar Creek, from the right before reaching a United States Geological Survey (USGS) stream gauge  from the mouth. The South Fork joins the main stem Bull Run River at the larger stream's  river mile (RM) 8 or river kilometer (RK) 13, near the midpoint of Bull Run Reservoir 2.===Discharge===Since 1974, the USGS has monitored the flow of the South Fork Bull Run River at a stream gauge  from the mouth. The average flow between then and 2008 was . This is from a drainage area of . The maximum flow recorded during this period was  on February 7, 1996.The minimum was  on October 13, 1994.
Watershed The Bull Run River watershed, which includes the South Fork Bull Run River, drains . The basin, which is the main source of Portland's drinking water, is largely restricted to uses related to water collection, storage, treatment, and forest management. The South Fork Bull Run River basin of about  amounts to about 11 percent of the total Bull Run River watershed, which is managed by the Portland Water Bureau and the United States Forest Service.
See also *List of rivers of Oregon*Bull Run National Forest
References
Works cited *McArthur, Lewis A., and McArthur, Lewis L. (2003) 1928. ''Oregon Geographic Names'', 4th edition. Portland: Oregon Historical Society Press. . *Portland Water Bureau (2007). "Landscape Conditions", Chapter 4 of ''Current Habitat Conditions in the  Habitat Conservation Plan Area''. Portland, Oregon: Portland Water Bureau. Retrieved March 9, 2010.
External links * Sandy River Basin Watershed Council* Sandy River Basin Partners* Forest Service, Mount Hood National Forest