The U.S Army Corps of Engineers (USAGE) require the Old CCS roofs at Lock and Dam 14 to be replaced. See attachments for more info, the POC for site visits, and how questions are to be submitted and b... The U.S Army Corps of Engineers (USAGE) require the Old CCS roofs at Lock and Dam 14 to be replaced. See attachments for more info, the POC for site visits, and how questions are to be submitted and by when.