After raising it by about eight feet last fall, the Tennessee Valley Authority will resume incrementally increasing the water level at Boone Lake on March 15. According to a newsletter this week from the TVA, the lake level will increase by about two feet per week, and TVA expects lake levels will be at or near summer pool (1,380 to 1,382 feet) sometime this summer. The agency anticipates lake operations will return to normal by July 2022. These âraise and holdsâ are part of the fluctuation and testing phase of the project, which will help the TVA evaluate the performance of the underground cutoff wall that crews installed to prevent erosion along the damâs earthen embankment.