• River: Osage River
• Surface Area: 55,600 Acres
• Average Depth: 20 Feet
The Truman Reservoir (also known as Truman Lake) is located in the state of Missouri, United States. It is the largest man-made lake in Missouri and the dam that created and manages the lake's water level. It is located between Clinton and Warsaw, on the Osage River and extends south to Osceola. The dam is located in Benton County, but the reservoir also extends into parts of Henry, St. Clair, and Hickory counties.
The U.S. Army Corps of Engineers built and manages the lake and dam. Its primary mission is flood control. Some other missions are power generation, recreation, and wildlife management.
Originally named Kaysinger Bluff Dam and Reservoir in 1954, when construction was authorized, construction began in August 1964. It was renamed the Harry S. Truman Dam and Reservoir in honor of the former president from Missouri by Congress in 1970. Construction was completed in 1979. The Kaysinger name refers to the bluff immediately north next to where the dam was eventually constructed. The bluff/cliff, a popular landmark even before the dam, overlooked the confluence of the South Grand River, Tebo Creek and the Osage River. The visitor center now sits on the bluff.
Completing the Truman Project took many years of planning, land acquisition, constructing new bridges and demolishing old ones. Several roads, towns, and cemeteries had to be relocated. The first construction project completed on the project was relocating Route 13 so it would be above maximum pool level.
The creation of the lake forced the closure of the Frisco Railroad's "Highline". Rising water levels severed the railroad tracks near Osceola and Deepwater and railroad officials declined to spend millions of dollars to reroute the lightly used tracks. The Missouri-Kansas-Texas Railroad, however, did relocate its main line between La Due and Clinton; the project included five miles of new track and a causeway/bridge combination over the lake.