SCH Number 2006082017

Project Info

Title

Interstate 680/State Route 4 Interchange Improvement Project

Description

CDFW has executed Lake and Streambed Alteration Agreement No. 1600-2017-0559-R3, pursuant to section 1602 of the Fish and Game Code to the project Applicant, Contra Costa Transportation Authority, as represented by Timothy Haile. Project activities authorized through this Agreement are limited to installation of a temporary cofferdam and associated dewatering, replacement of the existing Grayson Creek Bridge with new abutments and a three-span cast-in-place (CIP/precast concrete box girder or precast girder structure, extension of the existing state highway and maintenance access road on the west side of the creek channel, placement of supporting rock slope protection, and drainage system modifications to accommodate the bridge widening. The new structure will be 257 feet long and 173.1 feet wide (1.09 acres), replacing the existing two bridges totaling approx. 257 feet long and 74 feet wide (0.47 acres), an increase of 0.63 acres.

8 documents in project