Larkspur Marina Bulkhead Replacement Project (Notification of Lake or Streambed Alteration, No. EPIMS-MAN-56958-R3).

The Larkspur Marina Bulkhead Replacement Project involves replacing an aging bulkhead along the shoreline of Larkspur Lagoon in Corte Madera, California, with a new structure built using fiber-reinforced vinyl sheets installed via vibratory method from two 15-by-30-foot floating platforms, without any pile driving. The new wall will be constructed on the waterside of the existing bulkhead, with the space between the two structures filled with compacted material and capped, while the original concrete cap is removed as needed. Strict environmental safeguards are required, including the use of silt curtains to control turbidity and the closure of all lake inlets by November 30 to protect larval Longfin smelt during their vulnerable life stage. The lake outlet remains fully operational through a one-way duckbill valve to support flood control and water quality, supported by a pump system that connects to Corte Madera Creek to adjust lake levels seasonally. Access to the work area is limited to an existing easement over an outfall pipe in the northeast section of the lake, ensuring minimal disturbance to surrounding land and waterways. The project will result in permanent impacts of 8,538 square feet (0.196 acres) due to the installation of the new bulkhead and associated fill, while temporary impacts totaling 156,400 square feet (3.59 acres) will occur from the presence of floating platforms and silt curtains during construction—both of which must be removed immediately upon project completion. Regulatory approval is granted under Section 1602 of the Fish and Game Code via the Lake and Streambed Alteration Agreement EPIMS-MAN-56958-R3, with compliance verified under California’s Class 2 Categorical Exemption for the replacement of existing structures. No formal procurement process, pricing, or federal acquisition clauses are involved; the activity is managed as a direct environmental permit action under California jurisdiction, with oversight by the California Department of Fish and Wildlife, Region 3 – Bay Delta. Key contacts include Lewis Tanenbaum of the Larkspur Marina Property Owners’ Association and Jordan Beaton of CDFW, who serve as the project executor and environmental regulator respectively. Work is scheduled to be completed by November 30, 2025, aligning with species protection timelines and seasonal water management needs.