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Cowlitz Falls Barrier Dam Repair Project

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Cowlitz Falls Barrier Dam Repair Project

Shimmick is repairing and upgrading the Cowlitz Salmon Hatchery barrier dam in Salkum, WA. The project includes construction of a reinforced concrete weir infill section and concrete repairs to the existing apron and training walls. In addition, Shimmick is supplying and installing a left-entrance bulkhead and right flow deflector, supplying template for deflector embeds, and constructing a temporary system for water treatment.

The project entails inspection, repair, and reconstruction of the weir dam and apron slab, which was damaged by the existing weir’s shape and subsequent underwater hydraulic jump. The weir dam plays an important ecological and environmental role in the southern migration of  salmon, steelhead, and other fish species.

Project Details

Location:Salkum, WA
Amount: $11M
Delivery Method:Bid-Build
Client Name:City of Tacoma
Duration: 2021-2023
  • Shimmick did a remarkable job of coming into the emergency situation and analyzing the needs of CDOT…. Everyone was extremely professional and went over and above to address the flooding issues at multiple locations in Northeastern Colorado.

    Colorado Department of Transportation