Crooked River Valley Rehabilitation (NEW)
River, Stream and Wetland Restoration
Client / Agency
U.S. Forest Service - Nez Perce National Forest
Nez Perce Tribe
South Fork Clearwater River, Idaho
During the mid-1900s the lower Crooked River Valley was heavily impacted by dredge mining, leaving behind large tailing piles and deep ponds throughout the valley bottom. Gold and silver mining affected over 6 miles of the river and approximately 200 acres of the valley bottom. Physical changes to the valley bottom altered stream and riparian processes, and affected aquatic and terrestrial habitat conditions, resulting in degraded ecosystem conditions relative to historical conditions. The U.S. Forest Service Nez Perce National Forest and Nez Perce Tribe are leading efforts to improve ecosystem conditions in the lower Crooked River by re-grading the tailing piles and re-constructing the river and floodplain.
In 2013 RDG provided assessment and design services in for development of final design products including a final design report, final design drawings, cost estimates and technical specifications. RDG completed bathymetric surveys, habitat surveys and geomorphic investigations in support of evaluating limiting factors and providing criteria for the design. RDG worked collaboratively with the stakeholders and subcontractors to develop project phasing plans that met construction budget expectations and permitting requirements. Project design performance was evaluated using multi-dimensional hydraulic models. Model output was used to map aquatic habitat scenarios representing preferred habitat conditions for focal fish species including steelhead, Chinook salmon, bull trout and westslope cutthroat trout. Project implementation is scheduled for 2015-2016.