Does snow pack on Mt. Hood affect Portlands supply of water?
Rain is the primary source of water in the Bull Run watershed during the summer months. This makes Portland’s water system different from many others in Oregon, including water systems that rely on permanent snowpack. Rain in May and June often keeps the Bull Run reservoirs full into July. Although the watershed is in the northwest foothills of Mt. Hood, snowpack and glaciers on Mt. Hood cannot drain into the Bull Run watershed.
