Byron Highway Bridge Replacement Project (BRLS- 5928(104))

2 Documents in Project


SCH Number
Lead Agency
Contra Costa County
Document Title
Byron Highway Bridge Replacement Project (BRLS- 5928(104))
Document Type
MND - Mitigated Negative Declaration
Project Applicant
Contra Costa County Public Works Department
Present Land Use
Agriculture, Public/Semi-Public

Document Description
Contra Costa County Public Works Department (CCCPWD), in cooperation with the California Department of Transportation (Caltrans), proposes to replace the existing, obsolete Byron Highway Bridge (Bridge No. 28C-0121) over the California Aqueduct (Project). The Project will replace the existing bridge with a multi-span concrete bridge approximately 360 feet long, and a clear width of approximately 40 feet. The Project would also make approximately 1,350 total feet of roadway improvements on both sides of the new structure (approx. 2,700 feet of new roadway total). The proposed road and bridge would realign Byron Highway slightly to the south. In its final configuration, the replacement bridge would accommodate two lanes of vehicular traffic (one in each direction) with no increase in capacity. The proposed bridge would have eight-foot wide shoulders on both sides of the road. The eight-foot shoulders would meet American Association of State Highway and Transportation Officials (AASHTO) minimums and would be consistent with the countywide Bicycle and Pedestrian Plan that would accommodate a Class 2 facility with buffer striping at the Project site. The work also includes modified connections for four access roads near the ends of the bridge and modification of the Bruns Road intersection. The project will require relocation of communication lines (overhead and underground) and overhead electric distribution facilities and a relocation/extension of a siphon/culvert owned by Byron Bethany Irrigation District near Bruns Road. Underground utilities are attached to cross the existing bridge and would need to be relocated onto the new bridge including an 8-inch Chevron Oil line and 12-inch Natural Gas line. The proposed bridge would accommodate these utilities as well as capacity for future underground lines as well.

Contact Information
Ave' Brown
Contra Costa County Public Works Department
255 Glacier Drive
Martinez, CA 94553

Phone : (925) 313-2311


37°49'26"N 121°35'50.3"W
Contra Costa
Cross Streets
Byron Highway and Bruns Road
Total Acres
Parcel #
001-041-064, 001-041-024, 001-041-063, 001-041-004, 001-041-012, 001-041-035, 001-081-028, 001-0
Union Pacific Railroad (UPPR)
Byron Airport
Brushy Creek, Frisk Creek, Clifton Court Forebay & California Aqueduct & Delta Mendota Canal

Notice of Completion

Review Period Start
Review Period End
Development Type
Transportation:Local Road (Bridge Replacement Project)
Local Action
Other Action
Project Issues
Air Quality Archaeologic-Historic Biological Resources Geologic/Seismic Noise Toxic/Hazardous Tribal Cultural Resources Water Quality Wildlife
Reviewing Agencies
California Air Resources Board California Department of Conservation California Department of Fish and Wildlife, Bay Delta Region 3 California Department of Forestry and Fire Protection California Department of Parks and Recreation California Department of Transportation, District 4 California Department of Transportation, Division of Aeronautics California Department of Water Resources California Highway Patrol California Native American Heritage Commission California Natural Resources Agency California Public Utilities Commission California San Joaquin River Conservancy California State Lands Commission Central Valley Flood Protection Board Delta Stewardship Council Department of Toxic Substances Control Office of Historic Preservation State Water Resources Control Board, Division of Water Rights California Regional Water Quality Control Board, Central Valley Sacramento Region 5


Environmental Document
2_NOI   PDF 3120 K 3_ISMND and MMRP   PDF 12146 K 4_OPR_Summary_Form   PDF 619 K
1_NOC   PDF 255 K 1_NOC_Attachment   PDF 66 K
State Comments
2020070389_RWQCB Comment   PDF 324 K

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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