State Route 84 Niles Canyon Safety Widening Project

2 Documents in Project


SCH Number
Lead Agency
Caltrans 4 (Oakland) (California Department of Transportation, District 4)
Document Title
State Route 84 Niles Canyon Safety Widening Project
Document Type
NOD - Notice of Determination

Document Description
Project elements include improving sight distance and vertical clearances at the Rosewarnes and Farwell underpasses, widening shoulders to meet current standards, relocating the Palomares Road/State Route 84 intersection ~62.3 ft to south, providing a northbound left turn pocket at Palomares Road, and replacing the box culvert at Stonybrook Creek with a free span bridge. The new bridge at Stonybrook Creek will provide improved flow capacity to meet storm flow requirements while facilitating fish passage in Stonybrook Creek. The new bridge is also designed to allow bed load transport through the site, reduce channel maintenance requirements, and respond to the creek's normal aggradation and degradation cycles. In addition to the bridge replacement, the following structures will be removed from the stream channel: an old rock weir on Stonybrook Creek, remnants of an old road, asphalt bank protection, and a bridge abutment at the confluence of Stonybrook and Alameda Creeks. Approximately 1.946 acres of temporary and 1.898 acres of permanent riparian impacts will result from the construction of access and working benches in Alameda Creek, retaining wall construction in Alameda Creek, and armoring of the retaining walls with rock slope protection. The three retaining walls will have a combined length of ~2064 ft. This work will result in the removal of ~101 riparian trees.

Contact Information
Melissa Escaron
California Department of Fish and Game
Bay Delta Region P.O. Box 47
Yountville, CA 94599

Phone : (707) 339-0334


Cross Streets
Mission / Palomares
State Highways
Niles Canyon Railroad
Alameda Creek / Stonybrook Creek
Other Location Info
Niles Canyon

Notice of Determination

Approving Agency
Approving Agency Role
Responsible Agency
Approved On
Final Environmental Document Available at
Caltrans #4 P.O. Box 23600 Oakland, CA 94623-0060


(1) The project will have a significant impact on the environment
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
(3) Mitigated measures were made a condition of the approval of the project
(4) A mitigation reporting or monitoring plan was adopted for this project
(5) A Statement of Overriding Considerations was adopted for this project
(6) Findings were made pursuant to the provisions of CEQA

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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