Restoration Services

The project includes the design of seven miles of the Tuolumne River approximately 20 miles east of Modesto. The design includes creating a new meandering channel and overbank benches to maintain a 500-foot vegetated riparian corridor. The project was divided into five separate reaches. The project required approximately 167,000 cubic yards of material to be imported into the large mining pit to create a new meander. This first reach has been widely recognized as one of the first restoration projects of such magnitude in the state. Land  Development Desktop (LDD) was utilized on all projects to create a 3-dimensional model of the reaches. These models were used to generate accurate contour information of the proposed project quantity and construction cost estimates.  

As part of the post construction monitoring program for restoration efforts on the Tuolumne River, the local District wanted to  estimate the reduction in predatory species habitat along the post  project reach of the Tuolumne River. D&A utilized the River 2D  Hydrodynamic Model to evaluate the limits of small and large mouth bass habitat along the project reach. Habitat preference files for depth and velocity and index files for cover and substrate were created to delineate areas where bass habitat still exists.   The results of this model will be used for future designs along the Tuolumne River. 

 D&A provided final design plans for bank erosion protection, pool  and riffle design, and spawning gravel introduction for several reaches along the Trinity River. Services also included modeling for floodplain impact assessments and assistance with site topographic surveying. 

  D&A provided design for channel restoration and dam removal to  improve fish passage and habitat along Dry Creek. Project design also included an infiltration gallery and pump station diversion for local water supply. Restoration components included rock fish ladder, vegetated rock slope protection, and new foot-bridge and bike trail improvements.