Oregon Water Resources Department has developed an interactive web mapping tool to estimate the magnitude of peak discharges at various frequencies for rural, unregulated streams in Oregon. Peak discharge estimates are based on two studies, one for western Oregon and one for eastern Oregon, of the magnitude and frequency of peak discharges in Oregon.
These studies were completed in 2005 and 2006, respectively, by WRD with financial assistance from the Federal Emergency Management Agency, Oregon Department of Transportation, and the Association of Oregon Counties and with the cooperation of the U.S. Geological Survey. These studies were undertaken to provide scientists, engineers and land managers with the information needed to make informed decisions about development and restoration efforts in or near watercourses.