District 4 Environmental Documents by County

Jump to County: Alameda, Marin, Napa, San Francisco, San Mateo, Santa Clara, Solano, Sonoma


Caltrans complies with its requirements under Title VI of the Civil Rights Act of 1964. More information can be found at this link: https://dot.ca.gov/programs/civil-rights/title-vi 

District Wide Projects

State Route 37 Sears Point to Mare Island Improvement Project

Draft EIR/EA Volume 1 (PDF)
Draft EIR/EA Volume 2 (PDF)

The Final Environmental Impact Report/Environmental Assessment can be viewed here: 
Final EIR/EA Volume 1
Final EIR/EA Volume 2 (Appendices A-J)
Final EIR/EA Volume 3 (Appendix K: Public and Agency Comments and Responses)

I-680 Express Lane Completion Project

Proposed Overview - As a major north-south freeway, I-680 is a heavily traveled corridor that connects the southern San Francisco Bay Area with Interstate 80 (I-80) and passes through Santa Clara, Alameda, Contra Costa and Solano counties. Within Contra Costa County, travelers experience congestion, traffic bottlenecks within the corridor, and increased travel times. To improve system continuity, congestion relief and operations, the project—part of CCTA’s INNOVATE 680 program—proposes to construct a northbound express lane from Livorna Road to State Route 242 (SR-242). It would also convert the existing northbound high-occupancy vehicle (HOV) lane that runs from SR-242 to the Benicia-Martinez Bridge Toll Plaza, to an express lane. The goal of the project is to complete the I-680 express lane network through Contra Costa County to increase travel speeds for those choosing to use the express lane.

The commenting period will be open from June 15, 2020 to July 29, 2020.


Bruns Court Pedestrian Overcrossing Project

I-680/Sunol Boulevard Interchange Improvements Project

I-80/Ashby Interchange Project

I-80/Gilman Interchange Project 

State Route 84 Arroyo de la Laguna Bridge Project

I-580 and I-205 Roadside Safety Improvement Project

I-580 Safety Lighting Project

I-580 Storm Damage Permanent Restoration Project

  • ALAMEDA COUNTY, CALIFORNIA, DISTRICT 4 – ALA – 580 (PM 4.3) 04-0P120/0417000401 The California Department of Transportation (the Department) proposes to restore the function of an existing storm drain system and preserve the structural integrity of the surrounding embankment and highway along Eastbound I-580 in Alameda County. Project scope includes the replacement of corrugated metal pipe, grading and shoring of the existing slope, and backfill of the eroded embankment at Postmile 4.3. The Department has provided a virtual project presentation that includes an opportunity to comment on the project in leu of a formal public meeting (see website link below). However, the Department will provide an opportunity for a formal public meeting if requested. All requests must be made by the May 11, 2021 deadline.
  • 580 Storm Damage Permanent Restoration Project Initial Study – Proposed Mitigated Negative Declaration
  • View the virtual project presentation

I-580 Bridge Rehabilitation Project

I-680 Alameda Creek Bridge Scour Repair Project

I-680 HOV/express lanes project

I-880 Interchange Improvements (Whipple Road-Industrial Parkway Southwest and Industrial Parkway West)

I-880 Interchange Improvements (Winton Avenue and A Street)

I-880 Oakland-Alameda Access Project (OAAP)

Dublin Boulevard Extension Project RTPL 5432(019)


State Route 1 Bridge Rail Replacement Project

State Route 1 (SR 1) Capital Preventive Maintenance (CAPM) Project

State Route 1 Culvert Replacement Project

State Route 1 Drainage System Restoration Project

State Route 37 Flood Reduction Project From US 101 to Atherton Avenue

  • Fact Sheet
  • Draft Environmental Impact Report/ Environmental Assessment
    • Public Comment Period: August 25, 2023 through October 8, 2023. Comments may be submitted via the following methods:
      • Email to SR37FloodProject@dot.ca.gov
      • Postal Mail addressed to:
        Caltrans District 4
        ATTN: Skylar Nguyen, Senior Environmental Scientist
        P.O. Box 23660, MS: 88, Oakland, CA 94623-0660
    • A hybrid public meeting will be held on September 21, 2023, beginning at 6 pm to discuss the project.
      • To attend virtually via Webex: http://bit.ly/3YZzIRP
      • Ta attend the meeting in Person:
        Margaret Todd Senior Center
        1560 Hill Road, Novato, CA 94947

State Route 37 Petaluma River Bridge Preservation Project

State Route 37 Capital Preventive Maintenance (CAPM) Pavement Project

U.S. 101 Irwin Creek Culvert Rehabilitation Project

U.S. 101 Storm Damage Repair Project

U.S. 101 Tamalpais Overcrossing Project


State Route 29 Napa Bundle Northern Corridor Gas Pipeline Maintenance Program Project

State Route 29 Bridge Rail Replacement Project

State Route 29 Sulphur Creek and York Creek Bridge Rail Replacement Project

State Route 29/State Route 221 Soscol Junction Improvement Project

State Route 29 Ritchie Creek Bridge Replacement Project for Fish Passage Improvement

State Route 121 Tulucay Creek Bridge Replacement Project

State Route 128 Hopper Slough Bridge Replacement Project

San Francisco County

Better Market Street Project

San Mateo

State Route 1 Safety Barriers Project

State Route 1 Pescadero Creek Bridge Rails

State Route 1 Traffic Operational Systems Improvements Project

State Route 1 Multi-Asset Roadway Rehabilitation Project

State Route 1/State Route 84 Structures and Scour Mitigation

State Route 82 El Camino Real Roadway Renewal Project

State Route 84 Storm Damage Permanent Restoration Project

US 101/Produce Avenue Interchange Project

U.S. 101 Cordilleras Creek Bridge Replacement Project

U.S. 101 Managed Lanes Project North of I-380

I-280/I-380 Bridge Seismic Restoration Project: (Alpine Road Undercrossing Bridge, Sand Hill Road Overcrossing Bridges, and Interstate-280/Interstate-380 Separation Bridges)

Santa Clara

State Route 9 Saratoga Creek Bridge

Newell Road Bridge Replacement Project

I-280/Winchester Boulevard Interchange Improvements Project

  • Information regarding this project, including environmental documents, can be found on VTA's project page.


State Route 12 Roadway Resurfacing, Restoration and Rehabilitation Project

State Route 12 Major Pavement Rehabilitation (2R) Project

State Route 84 Real McCoy Fenders and Ramps Replacement Project

State Route 128 Putah Creek Bridge Rehabilitation


State Route 116 Bridge Railings Replacement Project

State Route 1 Drainage System Restoration Project

State Route 1 Drainage System Restoration Project

State Route 1 Soldier Pile Wall Project

State Route 1 Culvert Rehabilitation Project – North

State Route 1 Culvert Rehabilitation Project – South

State Route 1 Culvert Rehabilitation Project

State Route 1 Centerline Rumble Strip Project

State Route 12 Capital Preventive Maintenance Project

State Route 12 Boas Drive Intersection Safety Project

U.S. 101 Santa Rosa U.S. Highway 101 Bicycle and Pedestrian Overcrossing

State Route 116 Slide Repair Project

State Route 116 Stage Gulch Road/Lakeville Highway Intersection Safety Project

State Route 121 Bridge Railing Upgrade Project