SCH Number 2009061001

Project Info

Title

State Route 99/Avenue 12 Interchange Project

Description

The California Department of Fish and Game (DFG) is executing a Lake and Streambed Alteration Agreement, pursuant to Section1602 of the Fish and Game Code, to the Project applicant. Caltrans proposes to make improvements to the existing SR 99 - Avenue 12 Interchange including the overcrossing, ramps and surrounding local road network between PM 7.1 and 7.9. This will entail four jurisdictional crossings: Avenue 12 Overhead - The bridge will be 632 feet 8 ¼ inches long and 150 feet wide. It will be supported by two bents consisting of 5 columns each that will be 9 feet in diameter. County Road 29 North - The bridge will be 160 feet long and 64 feet wide. It will be supported by two piers consisting of 9 columns each that will be 2 feet in diameter. County Road 29 South - the bridge will be 212 feet long and 34 feet 10 inches wide. It will be supported by two pierces consisting of 6 columns each that will be 2 feet in diameter. Directional Onramp - The bridge will be 226 feet long and 26 feet 10 inches wide. It will be supported by three piers consisting of 4 columns each that will be 2 feet in diameter. For Bridge removal, no portion of the old structure will be left in the channel and where abutments are removed the depressions will be filled with clean gravel of an appropriate size (1/2 inch to 4 inches). Prior to demolition of the existing structure, a Demolition Plan will be submitted for approval by DFG. Construction equipment will need to enter the channel, and water is likely to be present when work is done in Cottonwood Creek so a water diversion will be required. The Project will require the removal of riparian trees, which may include cottonwood (Populus fremontil), California black walnut (Juglans californica), and Oregon ash (Fraxinus latifolia), but the exact species, size and number of trees is not yet known.

4 documents in project