Lake Ewauna is a reservoir located in Klamath Falls, Oregon that serves as the headwaters of the Klamath River. Fed by the Link River from Upper Klamath Lake, its water level remains constant throughout the year, controlled by the release of water from Keno Dam approximately 18 miles south of where the Link River enters the reservoir. The lake has a notable history as a log pond for several lumber mills during the 20th century, with some logs still remaining on the lake bottom even though the last floating logs were removed in the 1990s when the final mill closed. Lake Ewauna is also known as an ideal location for crew rowing, with the Ewauna Rowing Club using the lake for practice and competition since 1970.