Tyler Island Road Bridge over Georgiana Slough Technical Analysis (Streambed Alteration Agreement No. EPIMS-SAC-58445-R3)

The California Department of Fish and Wildlife has executed Lake and Streambed Alteration Agreement EPIMS-SAC-58445-R3 for the Sacramento County Department of Transportation to conduct a technical analysis of the Tyler Island Road Bridge over Georgiana Slough. Located near Isleton, California, the project is a geotechnical investigation designed to assess subsurface conditions at the existing bridge's pier locations, specifically addressing scour noted at the swing span piers. This investigation is critical for informing future repair decisions and design requirements. The scope of work includes drilling three boreholes and performing a cone penetration test near Piers 2 and 3, reaching a maximum depth of 120 feet below the ground surface. All investigative activities will be performed from a barge or small watercraft launched from an existing ramp to minimize environmental impact. The project is classified under a Notice of Exemption based on its status as minor data collection and resource evaluation that does not cause significant environmental disturbance; consequently, no vegetation will be removed and no water diversion will be conducted. While the technical specifications and administrative contacts, such as Senior Environmental Scientist Specialist Elijah Portugal, are clearly defined, the provided documentation does not include specific financial data, contract value, or a defined period of performance.