Interstate 680/State Route 4 Interchange Improvement Project

8 Documents in Project


SCH Number
Lead Agency
California Department of Transportation, District 4
Document Title
Interstate 680/State Route 4 Interchange Improvement Project
Document Type
FON - FONSI - Findings of No Significant Impact
Document Description
The project improves the interchange, in 5 phases, to alleviate operational deficiences. Phases 1 and 2 replace the northbound I-680 to westbound SR 4 loop ramp with a 2 lane flyover connector, and the eastbound SR 4 to southbound I-680 diagonal ramp with another 2 lane connector. Phases 3-5 replace other ramps and add new lanes.

Contact Information

Howell Chan
Agency Name
Department of Transportation, District 4
Contact Types
Lead/Public Agency


Contra Costa
Cross Streets
at I-680/SR-4 interchange
State Highways
Buchanan Field
Pacheco Slough and Grayson Creek
Other Location Info
City/Nearest Community: Pacheco

Notice of Completion

Project Issues
Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Economics/Jobs, Flood Plain/Flooding, Geology/Soils, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Noise, Public Services, Recreation, Transportation, Vegetation, Wetland/Riparian, Wildlife

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, 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.

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