The US Army Corps of Engineers, Walla Walla District is seeking sources to provide personnel, materials, supplies, equipment, transportation, supervision and other items and services for the following... The US Army Corps of Engineers, Walla Walla District is seeking sources to provide personnel, materials, supplies, equipment, transportation, supervision and other items and services for the following: Dworshak Skeleton Bay Draft Tube Bulkhead Rehabilitation. This project involves pickup, blasting, weld inspection, weld repair (if needed), painting and delivery of twelve draft tube bulkheads.