The Klamath River flows 257 miles through southern Oregon, along the Oregon and California border and empties into the Pacific Ocean.The watershed of the Klamath River is divided into an upper basin with the head of the river in Oregon’s Upper Klamath Lake and the lower basin at the mouth of the river in California. The geography of the watershed has been referred to as “a river upside down” as it flows from a high desert in Oregon toward the mountains and carves its path through the rugged Cascade Mountains.