The watershed contains much old-growth forest, such as this Douglas Fir forest.

The Bull Run watershed is the primary source of water for Portland, Oregon. It is located in the Mount Hood National Forest, within Multnomah and Clackamas counties. Image File history File links Download high resolution version (640x966, 345 KB) Douglas Fir Forest, Bull Run Watershed, Mount Hood National Forest, Oregon, USA Source URL: http://biology. ... Image File history File links Download high resolution version (640x966, 345 KB) Douglas Fir Forest, Bull Run Watershed, Mount Hood National Forest, Oregon, USA Source URL: http://biology. ... Old growth forest, sometimes called late seral forest or ancient forest is an area of forest that has attained great age and exhibits unique biological features. ... Species See text. ... Portland is the largest city in Oregon, and county seat of Multnomah County. ... Old-growth Douglas Fir in the Mount Hood National Forest The Mount Hood National Forest is located 20 miles (32 km) east of the city of Portland, Oregon, and the northern Willamette River valley. ... Location in the state of Oregon Formed 22 December 1854 Seat Portland Area  - Total  - Water 1,206 km² (466 mi²) 79 km² (30 mi²) 6. ... Clackamas County is a county located in the state of Oregon. ...

The watershed is about 102 square miles (264 km²) in area, and is separated from Mount Hood by a ridge. It typically receives 80-170 inches (2 to 4 m) of rainfall per year. A watershed is either (1) a region of land where water flows into a specified body of water, such as a river, lake, sea, or ocean or (2) a topographical boundary between catchment basins. ... Mount Hood is a dormant stratovolcano in northern Oregon, in the Pacific Northwest region of the United States. ... A ridge is a geological feature that features a continuous elevational crest for some distance. ... In meteorology, precipitation is any kind of water that falls from the sky as part of the weather. ...

The watershed is reserved solely for producing drinking water. It includes reservoirs, which store water for use during the city's dry summer months. The quality of its water is so high that the city does not treat or filter the water. Drinking water is water that is intended to be drunk by humans. ... Nothing!HAHAHAHAHA! ... Water (from the Old English word wæter; c. ... Water purification, or drinking water treatment, is the process of removing contaminants from surface water or groundwater to make it safe and palatable for human consumption. ...

External link

• Bull Run watershed from the Portland Water Bureau website