Chief Joseph Fish Hatchery

Design-build, pile supported work trestle and braced cofferdam in the Columbia River just downstream of the Chief Joseph Dam. Work included a 90-ft long pile support work trestle to support a 110-ton crane, excavation and concrete placement equipment. A cofferdam was constructed that included 85 pairs of 25 to 30-ft long sheet piles, two levels of internal bracing, and a structural tremie slab supported by tension rock anchors.

This fish hatchery being constructed at the Chief Joseph Dam and on the Colville Indian Reservation helped to re-introduce 2.9 million Chinook Salmon back to their native spawning grounds in Washington State.