Client: California State Parks- Diablo Vista District
The Mitchell Creek Riparian Restoration and Fish Passage Improvement Project provides for removal of four small dams and the decommissioning of defunct access roads along a reach of Mitchell Creek, within Mount Diablo State Park. The design includes approximately 400 feet of constructed roughened channel to provide fish passage through the grade transition created by the various impoundments. In addition to the fish passage improvements, the project removed aproximately 2,500 cubic yards of impounded sediments from upstream of the site to restore floodplain function and reduce local bank erosion. The design included the installation of large wood elements obtained on site to provide bank stability and enhanced pool development. Waterways provided construction oversight for the project.
Client: Syar Industries, Inc.
GEOMORPHIC ANALYSIS OF THE MIDDLE REACH OF THE RUSSIAN RIVER
Waterways, in cooperation with Swanson Hydrology and Geomorphology, is in the process of completing a detailed hydraulic, geomorphic and sediment transport analyses for the Russian River’s Middle Reach, near Healdsburg. This work focuses on the effects of in-stream mining and other human activities on channel morphology and flood capacity. A chrono-sequence of topographic surfaces representing the channel and floodplain were analyzed to calculate volumetric changes in channel geometry over the past 20 years. Then, a hydraulic model was constructed along 5 miles of the Russian River to evaluate land use impacts on flood elevations.
Client: City of Santa Cruz- Public Works Department
Waterways performs annual cross section surveys at seventeen permanent monitoring sections established along the San Lorenzo River, from Highway 1 to the river mouth. This project assists the City of Santa Cruz in meeting flood protection requirements and habitat restoration goals by quantifying changes in channel elevation, form, and vegetation cover. The monitoring data is presented in an annual report discussing the geomorphic and hydrologic trends, and providing adaptive management recommendations to the City’s riparian vegetation and sediment management operations.
Client: City of San Jose
Waterways staff was retained to assess existing conditions and provide recommendations for enhancement of riparian and aquatic habitat along 2.5 miles of stream channel within Alum Rock Park, in the City of San Jose. The assessment identified Quail Hollow as a high priority project site based on fish passage impediments, stream channel erosion, and recreational access concerns.
Client: Yamhill Basin Council
Gooseneck Creek, tributary to Mill Creek and the South Yamhill River, is an important tributary for steelhead/coho salmon spawning and rearing. The project area is located above the confluence with Mill Creek in a portion of the channel that was historically impacted by aggregate mining. Waterways was contracted by the Greater Yamhill Basin Council to develop a restoration design for approximately 2,000 feet of Gooseneck Creek that was incised down to bedrock due to past mining activities and historic plugging of a secondary channel. Confinement of the channel, in-channel mining activities, and loss of secondary channels had all but eliminated the natural pool-riffle morphology with a consequent loss of aquatic and riparian habitat.
Client: County of Santa Cruz Department of Environmental Health
The objectives of this project were to develop a comprehensive plan that identified, through focused research and analysis of existing data, the limiting factors affecting habitat and populations conditions on the San Lorenzo River for steelhead trout and coho salmon. The San Lorenzo River is noted as having the largest run of steelhead south of San Francisco Bay and historically supported populations of coho.
Client: Santa Cruz County Community Action Board
Waterways staff was retained to develop a fish passage improvement design for a concrete culvert that was hindering fish passage on Valencia Creek, in Santa Cruz County. Plans were developed to construct a concrete fish ladder structure, per design criteria established by the National Marine Fisheries Service (NMFS) and the California Department of Fish and Game (CDFG).