The Commission holds three water rights equaling 67 cubic feet per second (cfs) on the Big Butte Springs source. The Oregon Legislature closed Big Butte Springs drainage from any additional appropriation in 1925 and gave all additional water to the City of Medford. The Commission receives most of its water supply from the Big Butte Springs. The water begins as snowmelt on Mt. McLoughlin and percolates through volcanic soils to emerge again as springs.