Water Reliability Transmission and Ditribution Improvement - Conn Creek Water Line Project

3 Documents in Project


SCH Number
Lead Agency
City of Calistoga
Document Title
Water Reliability Transmission and Ditribution Improvement - Conn Creek Water Line Project
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Agriculture, Watershed & Open Space; Undefined
Document Description
The Draft Initial Study/Mitigated Negative Declaration is being circulated for public and agency review. The City of Calistoga (City) proposes the Water Reliability Transmission and Distribution Improvement - Conn Creek Water Line Project (project). The project would upgrade an underground segment of the existing North Bay Aqueduct (NBA) pipeline that crosses the Conn Creek floodway. Approximately 100 linear feet of the underground NBA pipeline alignment is proposed to be relocated to an elevated position on the new Conn Creek Bridge, which was replaced by the California Department of Transportation (Caltrans) in 2020. In addition, the project includes replacement of up to 3,000 linear feet of 12-inch-diameter underground pipeline with new 16-inch-diameter underground pipeline in the same location parallel to and along the south side of Silverado Trail, which is a two-lane public roadway and a portion of which is also Highway 128. Replacing the eixsting pipeline involves removal of the exiwsting concrete cap and pipeline within the creek bed. The project is located in unincorporated Napa County. All proposed permanent project elements would occur within rights of way owned by Napa County and Caltrans.

Contact Information

Hamid Heidary
Agency Name
City of Calistoga
Contact Types
Lead/Public Agency


Northern California, Unincorporated
Cross Streets
Conn Creek Road and Silverado Trail/Highway 128
Total Acres
State Highways
Highway 128, Highway 29
Conn Creek

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Divison of Financial Assistance, California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Transportation, District 4 (DOT)
State Reviewing Agency Comments
California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Transportation, District 4 (DOT)
Development Types
Water Facilities (replacement)(Type pipeline , MGD 1)
Local Actions
Encroachment Permit
Project Issues
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, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire


Notice of Completion [NOC] Transmittal form
State Comment Letters [Comments from state reviewing agencies]

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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