Lucas Valley Road Milepost 9.6 Bank Repair (Lake or Streambed Alteration Agreement No. EPIMSMAN-17430-R3)


SCH Number
Public Agency
California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW)
Document Title
Lucas Valley Road Milepost 9.6 Bank Repair (Lake or Streambed Alteration Agreement No. EPIMSMAN-17430-R3)
Document Type
NOE - Notice of Exemption
Document Description
The Project is limited to installing a new approximately 36-foot-long Cast-in-Drilled-Hole (CIDH) retaining wall and planted rock riprap buttress on the bank of Nicasio Creek. The CIDH retaining wall includes four 24-inch-diameter CIDH concrete piles approximately 20 feet deep and a cable railing along the roadway. The CIDH retaining wall will be immediately adjacent to an existing retaining wall and rock riprap authorized by Agreement 1600-2017-0388-R3. The walls will be joined using 0.5-inch pre-molded expansion joint filler. Approximately 250 square feet and 36 linear feet of 0.5-ton rock riprap planted with willow (Salix sp.) stakes will be installed at the toe of bank below the CIDH retaining wall. The Project will temporarily dewater Nicasio Creek. No trees will be removed. Approximately 1,320 square feet and 60 linear feet of Nicasio Creek will be temporarily impacted by the Project and approximately 286 square feet and 36 linear feet will be permanently impacted by the Project.

Contact Information

Alexander Single, Environmental Scientist
Agency Name
Job Title
Environmental Scientist
Contact Types
Responsible Agency


Unincorporated Area
Northern California, San Francisco Bay Area
Other Location Info
The Project is located at Nicasio Creek, at Milepost 9.6 on Lucas Valley Road, in an unincorporated area of the County of Marin, State of California. The Project is approximately 0.6 miles southeast of the intersection of Lucas Valley Road and Nicasio Valley Road. The approximate Project coordinates are Latitude 38.050195°N, Longitude 122.682723°W.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Reasons for Exemption
The Project consists of repair, maintenance, or minor alteration of an existing structure involving negligible or no expansion of existing or former use.
County Clerk


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