Umpqua River Oregon North Umpqua PhotoMosaic 1939
The Umpqua River drains 12,103 square kilometers (4,673 square miles) in southwest Oregon 
before flowing into the Pacific Ocean at Winchester Bay near the city of Reedsport. In cooperation with the Portland 
District of the U.S. Army Corps of Engineers (USACE), the USGS evaluated sediment transport and gravel storage …