River traffic was halted April 12 at the James Trimble Lock and Dam on the Arkansas River (Lock and Dam 13) as elements of the U.S. Army performed a river assault and bridge-building exercise. A safety zone was established by the U.S. Coast Guard for the Arkansas River from Miles 289 to 292.8, and it remained in effect from 11 a.m. through 4 p.m. April 12.
According to Jay Woods, public affairs officer for the Little Rock Engineer District, it was an evaluation exercise for the 739th Multi-Role Bridge-Building Company. Elements of the 49th Engineer Battalion and the 806th Area Clearance Company also took part in the annual exercise. About six specialized bridge-erection boats were involved, along with eight pontoon bridge sections.