Mark Twain Lake is a reservoir located in Ralls and Monroe Counties in the U.S. state of Missouri.

With support and expertise of many, including Representative Clarence Cannon, the multi-purpose project was authorized by Congress in the Flood Control Act of October 1962.

[1] Clarence Cannon Dam and Mark Twain Lake provide opportunities for outdoor recreation - boating, swimming, fishing, picnicking, hiking and hunting.

All visitors can enjoy the 54,000 acres (22,000 ha) of land and water at Clarence Cannon Dam and Mark Twain Lake.

Camping fees and facilities differ in the areas, however most have electric hookups, showers, restrooms, sanitary stations, fire grills, picnic tables and playground equipment.

Campfire programs are held throughout the summer at outdoor amphitheaters in the campgrounds and give visitors the opportunity to learn more about the natural and cultural history of the area.

Boaters can use numerous boat ramps located conveniently around the lake as well as two full service marinas.

For hunters, there are thousands of prime hunting grounds easily accessible from hunter/fisherman parking lots located throughout the area.