• River: Missouri River
• Length: 76 Miles
• Surface Area: 35,181 Acres
• Volume: 2,050,900 Acre Feet
• Drainage Area: 15,860 Square Miles
Canyon Ferry Lake is a reservoir on the Missouri River near Helena, Montana and Townsend, Montana. It is Montana's third largest body of water, covering 35,181 acres and 76 miles of shore. It was formed by the building of Canyon Ferry Dam, which was completed in 1954 and has been used for electricity, irrigation, and flood controls since. The lake is a popular outdoor destination providing boating, fishing, wildlife habitat, and is nestled against the Big Belt Mountains of the Rocky Mountains. Canyon Ferry Lake has also become a leading ice boat venue for iceboat racing and iceboat world speed record attempts. The former town of Canton lies beneath the lake, having been submerged following construction of the dam.
Canyon Ferry Lake was formed when Canyon Ferry Dam was built, blocking the Missouri River. Canyon Ferry Lake is very popular and receives the most use of any lake in the state. This is due to both its size and location. The lake is quite large, even by Montana standards, measuring more than thirty-miles long and up to five miles wide. Since the lake lies just fifteen miles from Helena, the state capital, it receives heavy use during warm weather and on the weekends.