Approximate - nearest available gauge. Use as general reference only.
Construction of the original wooden dam began in 1921 and the generators were placed into service in September 1924. In 1961 a new concrete dam was constructed to replace the original structure. The dam is 300' high and is used to divert flow from the dam down to the Gorge Powerhouse through a tunnel in the bedrock on river left. As a result, this segment of the Skagit River is dewatered for much of the year except for spill events when flow exceeds the capacity of the tunnel or during periods of project maintenance.