MVE is a part of a team of consultants for 8 miles of improvements and widening of I-5 from Country Club Drive to Eight Mile Road. MVE consulted with the above team to provide a bridge hydraulics report.

The purpose of this report was to provide hydraulic data for the waterways intersecting bridges along Interstate 5 in Stockton, California. This data will be used for the design of new structures at these waterways as part of the widening project. In particular, the report investigates five bridges: Bear Creek (29 0177L/R), Mosher Slough (29 199L/R), Five Mile Slough, Fourteen Mile Sough (29 0175L/R), and the Calaveras River (29 0174L/R).

Information in the report included:

• A brief description of the type of bridge and its location

• Identification of any existing hydraulic problems or issues

• Identification of existing soffit elevations through use of existing topographic data

• Determination of flow rates for the 2-year, 50-year, 100-year, and 200-year events

• Determination of water surface elevation for the 2-year, 50-year, 100-year, and 200-year events

• Determination of high water elevations

• Allowable freeboard determined in accordance with section 821.3(i) of the Highway Design Manual

• Span length based on existing As-Built plans and proposed widening

• Determination of hydraulic skew

• Channel migration determined through research and review of bridge inspection reports

• Determination of aggradation/degradation