LEXINGTON, Neb. (AP) – The water level at Johnson County lake south of Lexington will be lowered for a maintenance project.  KNOP-TV reports that the Central Nebraska Public Power and Irrigation District needs to lower the water after Labor Day weekend to replace a circuit breaker and related measures at the hydroelectric plant at the lake. The district says the water level will begin to drop Sept. 6 and should be down about 3 feet by Sept. 26. This allows water to be diverted around the plant. Water levels will return to normal after the project is complete.