Mount Lassen Drive Bridge Preventive Maintenance Project


SCH Number
Public Agency
Marin County
Document Title
Mount Lassen Drive Bridge Preventive Maintenance Project
Document Type
NOE - Notice of Exemption
Document Description
The project will generally include constructing one reinforced concrete curtain wall at approximately 34 feet in length and one reinforced concrete closure wall at approximately 4.6 feet in length along the bridge abutments and piers to prevent future scouring from occurring. Approximately 3-5 of soil will need to be excavated to install these walls. In addition, bank and channel stabilization measures will be implemented and the bridge deck will be treated to seal cracks and prevent water intrusion. A temporary creek diversion plan, consisting of cofferdams, may be necessary to dewater the work area.

Contact Information

Jason Wong
Agency Name
County of Marin DPW
Job Title
Senior Engineer
Contact Types
Lead/Public Agency


Other Location Info
The project is located on Mount Lassen Drive (over Miller Creek) between Lucas Valley Road and Jeannette Prandi Way

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Categorical Exemption 15301 Existing Facilities, Class 1 (D)
Reasons for Exemption
The deterioration along the bridge abutment and piers due to scour poses a threat to public safety because it may comprise the bridge structural integrity. The Caltrans Bridge Inspection Report recommends repairing the scouring at this location to prevent further deterioration. This repair will protect the bridge abutments and piers and allow Mount Lassen Drive to remain open for emergency vehicles and the traveling public.
County Clerk


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