Bull Run Lake is a reservoir, an impoundment of the Bull Run River in the U.S. state of Oregon. Providing part of the primary drinking water supply for Portland, Oregon, it rates highly as an oligotrophic lake, a very clean source of water. As of 1925, noted geographer Lewis A. McArthur described the lake as one of the two most important in the state, sup…Bull Run Lake is a reservoir, an impoundment of the Bull Run River in the U.S. state of Oregon. Providing part of the primary drinking water supply for Portland, Oregon, it rates highly as an oligotrophic lake, a very clean source of water. As of 1925, noted geographer Lewis A. McArthur described the lake as one of the two most important in the state, supplying the drinking water for a third of the state's population.
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