CorpsLocks (CorpsLocks.com) has a wealth of inland waterway navigation information at your fingertips. Find out where a vessel is on our inland waterway system. Use the lock queue report to see what the traffic is like at a particular lock. Calculate tonnage for a particular lock. The Corps Locks website contains lock and vessel specific information derived from the United States Army Corps of Engineers Lock Performance Monitoring System (LPMS). The information contained here represents a half-hourly updated snapshot of U.S. flag vessels and foreign vessels operating in U.S. waterways that transited a Corps-owned or operated lock structure.