With water anticipated to rise above the lockwall at Lock and Dam 4, in Alma, Wisconsin, personnel from several Mississippi River locks helped prepare the site for high water on March 29. Judy Denzer, lockmaster, explains how handrail removal, jersey barriers, snow fencing and sand bags will minimize damage to electrical and mechanical components of the lock by keeping debris off the structure and moving downstream. #2019FloodFight Mississippi Valley Division (US Army Corps of Engineers) | U.S.