MKARNS - Effective July 1, 2013, the daily closures implemented as part of the Inland Marine Transportation System (IMTS) Levels of Service initiative will cease at the Locks of Ozark (No. 12) NM 256.8, Trimble (No. 13) NM 292.8, Webbers Falls (No. 16) NM 366.6, Chouteau (No. 17) NM 401.4 and Newt Graham (No. 18.) NM 421.6.