Project Description

Middle & Upper Columbia River

Since 2001, we have performed 11 detailed reach assessments and developed restoration strategies on over 100 miles of stream within key watersheds of the Methow, Entiat, Wenatchee, Yakima, and Klickitat rivers. This up-front planning work has led to over 50 actual in-the-ground restoration projects for the Yakama Nation. Projects have included main channel, off-channel, riparian, and floodplain habitat enhancement. Specific project types have included dam removals, culvert replacements, side channel creation, levee removal, large wood structures, headwater meadow restoration, restoration of incised channels, fish screening, and bank habitat complexity. Below are snapshots of a few of our reach assessments and completed projects.

These large-scale assessment and planning efforts include aquatic habitat inventories, fluvial geomorphic assessments, and hydraulic analysis.

The results from these technical analyses are integrated with recovery planning priorities and project opportunities as part of a coordinated restoration strategy.

The restoration strategy identifies the recommended type of treatments, feasibility of treatments, and prioritization/sequencing.

The Toppenish 3-way restoration included levee removal, abandoned diversion structure removal and design of new irrigation routing to existing diversion upstream with a fish screen, channel construction and remeanding, alcove activation, reconnected floodplain, floodplain roughness, setback levee to protect downstream infrastruture, and large wood jam installation.

This new 3,600-foot side channel on the Chewuch River provides a diversity of aquatic and riparian habitat.

The side channel design also incorporated natural bedforms and wetland benches adjacent to the side channel, to further enhance habitat potential.

At the Signal Peak site on the Entiat River, we placed preassembled log-boulder units by crane along a total of 450 feet of road embankment riprap at two sites.