Figure 4-6 Total Number of Hours of Lock Closures: 2000-2014
Thursday, March 31, 2016
SOURCE: U.S. Army Corps of Engineers, Navigation Data Center, Lock Performance Monitoring System. Locks by Waterway, Locks Unavailability, Calendar Years 1993-2014
(May 22, 2015). Available at http://www.navigationdatacenter.us/ as of June 2015.