A no wake restriction has been placed on Lake George, Lake Ballantyne, Duck Lake and Madison Lake in Blue Earth County. The restrictions take effect immediately due to abnormally high water levels. Authorities say recent rains have created shoreline erosion concerns and encroachment on surrounding homes and cabins. Some docks on the lakes have been submerged and debris has been washed into the lakes creating a boating hazard. The Blue Earth County Sheriff's Office says it will continue to monitor lake levels to determine when the restriction will be lifted.