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Portland Water Bureau

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Powell Butte II

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Managing stormwater on Powell Butte

The return of the rainy season reminds us that Johnson Creek, which runs through southeast Portland, has a history of flooding. That is one of the reasons that stormwater management is a top priority and a critical component of the Powell Butte 2 Reservoir project. The stormwater management methods employed on the butte are designed and built to accommodate rainfall amounts that could result from a 100-year rain event - the amount of precipitation that could be equaled or exceeded every 100 years, on average.
other holding pond
 
Photo above: One of two temporary stormwater holding ponds collect and detain rainfall before the water is slowly discharged to Johnson Creek.

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Spam Prevention In the Pacific Northwest, what state is Portland in?