TN NWR - Henry, Benton, Humphreys, and Decatur Counties. 07/09/13 The Busseltown Unit was closed today to vehicle traffic due to incoming floodwaters. The Big Sandy Unit will probably have some roads closed as water levels continue to rise this week. The Duck River Unit will be close to flooding this weekend based on present predictions, which have been changing all week. Call before traveling any long distances to Big Sandy and Duck River. Clayton Ferrell