DESCRIPTION
Walla Walla County Conservation District proposes to create final engineering designs for a fish habitat restoration project. This project is located in Walla Walla County, on the Touchet River at river mile 41.5-42.5, approximately ½ mile below the confluence of the Touchet River and Coppei Creek, 1 mile west of the city limits of Waitsburg. The proposed project reach is located within the Touchet River MSA, Priority Restoration Reach and a Major Spawning Area for ESA listed Mid-Columbia River DPS Steelhead as identified in the Snake River Salmon Recovery Plan (2011). This is also designated a critical habitat for Bull Trout by the US Fish & Wildlife in 2010.
The overall goals are to develop an engineered design that will ultimately restore natural riverine processes including increased channel roughness elements, promote sediment sorting and storage and create a dynamic floodplain and instream environment with complex side channels and large wood features. The project, when constructed, will provide Mid-Columbia steelhead adult holding and juvenile rearing habitat, bull trout overwintering habitat, and non-ESA listed spring Chinook passage and holding habitat. This design would augment three other major restoration projects already completed in this reach. Those projects include; Touchet River Mile 42.5 Habitat Enhancement, Prism # 07-1527, and is adjacent and upriver of the Touchet River McCaw Reach Projects Phases A (11-1580) & B (16-2099)
The Walla Walla County Conservation District hired an engineering team and they created final engineered designs for a fish habitat restoration project. The overall goals of the engineered design are to restore natural riverine processes including increased channel roughness elements, promote sediment sorting and storage, and create a dynamic floodplain and instream environment with complex side channels and large wood features. The project, when constructed, will provide Mid-Columbia steelhead adult holding and juvenile rearing habitat, bull trout overwintering habitat, and spring Chinook passage and holding habitat. A geotechnical memo is included in the engineering report. An alternatives analysis was completed in Oct. 2021, preliminary design Jan. 2022 and final design March 2022. Each stage was reviewed with select stakeholders and RCO review panel members as appropriate. The design includes approximately 2 pilot cuts, 4 pile fields, and 28 engineered log jams.