Lock and Dam 15 Mississippi River Guidewall Replacement
Work on this Lock and Dam was done off of Arsenal Island and barges. Helm replaced 400 feet of guidewall over 3 winter seasons. For each repair, a cofferdam was built on the river side. Next, the cofferdam was dewatered and the 80-year old guidewall was removed. A new guidewall was formed and poured over new drilled caissons.