Interstate 680 Southbound High Occupancy Vehicle (HOV) Gap Closure Project

4 Documents in Project


SCH Number
Lead Agency
Caltrans 4 (Oakland) (California Department of Transportation, District 4)
Document Title
Interstate 680 Southbound High Occupancy Vehicle (HOV) Gap Closure Project
Document Type
FIN - Final Document
Present Land Use
I-680 Freeway

Document Description
Note: FYI Final As the CEQA lead agency, Caltrans, in cooperation with the Contra Costa Transportation Authority (CCTA), is proposing to improve traffic operations and relieve congestion by closing the current high--occupancy vehicle (HOV) lane gap on southbound Interstate 680 in Contra Costa between Livorna Road and Geary Road. The HOV lane would be added through roadway widening and restriping of the existing roadway. The median barrier would be upgraded to meet current standards. The South Main Street Undercrossing would be widened to accommodate the HOV lane. The two existing combined retaining/soundwalls located between the Rudgear Road interchange and South Main Street would be replaced, and a new soundwall would be constructed at the edge of the shoulder of NB I-680, just north of the North Main Street interchange. All work would be within existing Caltrans and local street right-of-way.

Contact Information
Cristin Hallissy
California Department of Transportation, District 4
111 Grand Avenue PO Box 23660
Oakland, CA 94612

Phone : (510) 622-8717


Walnut Creek
Cross Streets
Livorna Road to Geary Road
State Highways
SR 24, 242
30 schools
Las Trampas Creek, San Ramon Creek, Tice Creek, Walnut Creek

Notice of Completion

Development Type
Transportation:Highway/Freeway (HOV)
Project Issues
Air Quality Archaeologic-Historic Biological Resources Drainage/Absorption Flood Plain/Flooding Geologic/Seismic Noise Soil Erosion/Compaction/Grading Toxic/Hazardous Traffic/Circulation Vegetation Water Quality Water Supply Wetland/Riparian Land Use Cumulative Effects
Reviewing Agencies
California Air Resources Board California Department of Fish and Wildlife, Bay Delta Region 3 California Department of Parks and Recreation California Highway Patrol California Native American Heritage Commission California Public Utilities Commission California Regional Water Quality Control Board, San Francisco Bay Region 2 Caltrans, Division of Aeronautics Department of Water Resources Resources Agency

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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