Atmospheric River Capture Project

Atmospheric River Capture Project

The Marin Municipal Water District (District) is proposing the Atmospheric River Capture Project (Project) to deliver water under the District's existing agreement with the Sonoma County Water Agency (Sonoma Water) to Nicasio Reservoir for storage to improve water supply reliability under dry conditions. Since publication of the March 2026 NOP, the Project has been revised to include the development and implementation of a long-term management plan to address sediment and vegetation buildup in Upper Nicasio Creek in the unincorporated community of Nicasio. This includes vegetation and sediment removal, approximately 50,000 cubic yards, over at least two construction seasons along approximately 3,150 linear feet of Upper Nicasio Creek and 1,200 linear feet of Halleck Creek; lowering the existing delta sediment deposits in Nicasio Reservoir by approximately 4 feet to create a lowered bench approximately 100 feet wide along 2,000 linear feet of the right bank of Upper Nicasio Creek; maintenance activities on an as-needed basis; staging in designated areas; and off-hauling of vegetation and excavated sediment to an off-site location for disposal or reuse. Additional Assessor's Parcel Numbers include: 121-230-24, 121-070-11, 121-050-46, 121-050-43, 121-050-34, 121-050-13, 121-050-45, 121-050-74, 121-050-11, 121-090-05, 121-090-04, and 121-090-03.

Novato, Unincorporated Nicasio

Marin

Northern California, Unincorporated

California Air Resources Board (ARB), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Toxic Substances Control (DTSC), California Department of Transportation, District 4 (DOT), California Department of Transportation, Division of Aeronautics (DOT), California Department of Transportation, Division of Transportation Planning (DOT), California Department of Water Resources (DWR), California Fish and Game Commission (CDFGC), California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), California State Lands Commission (SLC), Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Drinking Water, District 25 (SWRCB), State Water Resources Control Board, Division of Water Quality, State Water Resources Control Board, Division of Water Rights, State Water Resources Control Board, Divison of Financial Assistance

Water Facilities (Two pumping stations and pipeline)(Type Water storage, MGD 30), Other (Sediment and vegetation removal)

Site Plan

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Energy, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Septic System, Sewer Capacity, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire