MILTON-FREEWATER — Work has begun to repair flood damage to the Nursery Bridge drop structure on the Walla Walla River.

Just downstream of the bridge on Eastside Road, the structure was damaged in 2015 by high river flows. U.S. Army Corps of Engineers officials said the repair project is slated to be completed by October.

A drop structure allows water to a lower elevation while controlling the energy and velocity of the water as it passes over.

Constructed in 1967, the drop structure is part of the Milton-Freewater levee system that protects the city and surrounding areas from flooding.

A contract for about $356,998 has been awarded to LKE Corp, of Washougal, Wash., to perform the work. The repair plans will help protect the structure’s gabions — metal, cage-like boxes filled with rocks — by adding rip rap.

As part of the project, members of Milton-Freewater Boy Scout Troop 315 will help plant 275 willow cuttings downstream of the drop structure as mitigation for placing rip rap in the stream, Corps officials said.