State Route 239 Project

Summary

SCH Number
2021120436
Lead Agency
California Department of Transportation, District 4 (DOT)
Document Title
State Route 239 Project
Document Type
NOP - Notice of Preparation of a Draft EIR
Received
Present Land Use
Residential, conservation, state water infrastructure, watershed, agriculture, recreation
Document Description
Caltrans, in partnership with the Contra Costa Transportation Authority (CCTA) as the project sponsor, proposes to provide a new, 4-lane highway from State Route 4 near Marsh Creek Road in Contra Costa County to I-205 and/or I-580 in Alameda County and/or San Joaquin County. This new route would improve the transportation network for an area that has few north-south roadway connections between eastern Contra Costa County and the western San Joaquin Valley. The SR 239 Project would provide relief from commute traffic through the town of Byron, enhance mobility in eastern Contra Costa County, and improve access to the Byron Airport. Caltrans and CCTA are also considering multimodal alternatives for the SR 239 Project. The overall SR 239 corridor is being evaluated at both a Tier I (program) level and a Tier II (project) level. Two alternatives for Tier I are being considered. Alternative A would be a 4-lane highway with an alignment east of the Byron Airport that would turn southward and connect to the I-580/I-205 interchange. Alternative B would be a 4-lane highway with an alignment east of the Byron Airport that would run parallel to and west of Byron Highway before joining Byron Road and connecting to I-205 west of Tracy. The Tier II, or initial phase, is proposed to be a 2-lane highway between State Route 4 near Marsh Creek Road and the Byron Airport.

Contact Information

Name
Wahida Rashid
Agency Name
Caltrans
Job Title
Senior Environmental Planner
Contact Types
Lead/Public Agency / Project Applicant

Name
Cody Ericksen
Agency Name
Caltrans District 4
Job Title
Associate Environmental Planner
Contact Types
Lead/Public Agency / Project Applicant

Location

Cities
Brentwood, Town of Byron, Community of Mountain House, Tracy
Counties
Alameda, Contra Costa, San Joaquin
Regions
Countywide, Northern California, San Francisco Bay Area
State Highways
SR 4, I-205, I-580
Railways
UPRR Mococo Line
Airports
Byron Airport
Waterways
Clifton Court Forebay, California Aqueduct, Delta Mendota Canal
Other Location Info
Caltrans, in partnership with the Contra Costa Transportation Authority (CCTA) as the project sponsor, proposes to provide a new, 4-lane highway from State Route 4 near Marsh Creek Road in Contra Costa County to I-580 in Alameda County or to I-205 in San Joaquin County.

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Fish and Wildlife, Central Region 4 (CDFW), California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Transportation, District 10 (DOT), California Department of Transportation, District 4 (DOT), California Department of Transportation, Division of Aeronautics (DOT), California Department of Transportation, Division of Transportation Planning (DOT), California Department of Water Resources (DWR), California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), California Transportation Commission (CATC), Central Valley Flood Protection Board, Delta Protection Commission, Delta Stewardship Council, Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Rights, California Native American Heritage Commission (NAHC)
State Reviewing Agency Comments
California Native American Heritage Commission (NAHC)
Development Types
Transportation:Highway/Freeway (Construction of Highway (SR 239))
Local Actions
Transportation Improvement
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Economics/Jobs, Flood Plain/Flooding, Geology/Soils, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Noise, Transportation, Tribal Cultural Resources
Local Review Period Start
Local Review Period End

Attachments

Draft Environmental Document [Draft IS, NOI_NOA_Public notices, OPR Summary Form, Appx,]
Notice of Completion [NOC] Transmittal form
State Comment Letters [Comments from state reviewing agencies]

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 state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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