Chalk Mountain Road Over North Fork Cache Creek Bridge Replacement Project (Bridge No. 14C-0048)

Summary

SCH Number
2022110262
Lead Agency
Lake County
Document Title
Chalk Mountain Road Over North Fork Cache Creek Bridge Replacement Project (Bridge No. 14C-0048)
Document Type
MND - Mitigated Negative Declaration
Received
Present Land Use
Bridge/ROW/ “O”-“FF”-“WW”, “RL”-“FF”-“B5” Open Space District-Floodway Fringe-Waterway, Rural Lands-Floodway Fringe-Special Lot size/Density/ Public Facilities PF
Document Description
The existing bridge has a sufficiency rating of 26.7 and has been designated as structurally deficient per the Caltrans Structure Maintenance & Investigations, Local Agency Bridge List (February 2015). In its current condition, the foundations of the existing structure are unknown, the nearest structure Bridge No. 14C0051, Wolf Creek Road over Wolf Creek, was constructed in the same year, with the same engineer, and part of the same development. Flows in Wolf Creek in the spring of 1968 caused the Wolf Creek Road Bridge to settle some six inches. Similar substructure vulnerabilities may exist with the Chalk Mountain Road Bridge. In addition, the slope protection at Abutment 1 is undermined with pier 2 scour exposure at the top of footing. Caltrans has reviewed the preliminary details of the project and supports a full replacement scope. The purpose of the proposed project is to provide a replacement structure that is consistent with appropriate Caltrans structural design standards, is placed on a road alignment that meets the appropriate AASHTO roadway geometry standards, and is hydraulically capable of passing and clearing the design storm events (50-year storm plus 2 feet of freeboard and 100-year storm). The replacement bridge will be wider to comply with current AASHTO standards for local rural roads, including 9-foot travel lanes and 2-foot shoulders, plus crash-tested vehicular barriers. A Class 1 bike trail is also proposed. The replacement structure will be approximately 230 feet long. It is anticipated that deep foundations will be needed to support the replacement bridge. The underlying formation of the soil is rock overlaid by alluvial and fan deposits which have washed down from the mountains. The upper materials are subject to scour; this is often best suited for concrete piles, as they can be designed to act as columns if the soil material scours away. The most feasible pile type will be determined during the type selection process, when further geotechnical information is available. The proposed project also includes a separated (Class 1) multi use path in the design of the bridge deck width of the replacement bridge. The Class 1 train is needed to support the local non-motorized traffic from the adjacent Spring Valley Community Center, camping areas, and parks. The Class 1 Trail is also needed to be in compliance with the Cache Creek Coordinated Resources Management Plan (CRMP) for Zone B. Under the National Environment Policy Act (23 USC 326), a categorical exclusion was signed on July 20, 2020, by Caltrans for the proposed project. Per the California Code of Regulations, Title 14, Division 6, Article 5, an initial study has been prepared for this project.

Contact Information

Name
Laura L Hall
Agency Name
Lake County
Job Title
Senior Planner
Contact Types
Lead/Public Agency

Location

Cities
Unincorporated Lucerne
Counties
Lake
Regions
Unincorporated
Cross Streets
Wolf Creek Road
Zip
95458
Total Acres
4.39 Project Imp
Parcel #
062-471-01, 02, 03, 062-481-03, 05
State Highways
20
Waterways
Cache Creek
Township
14N
Range
07W
Section
12

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 Fish and Wildlife, North Central Region 2 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Resources Recycling and Recovery, California Department of Transportation, District 1 (DOT), 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, Central Valley Sacramento Region 5 (RWQCB), California State Lands Commission (SLC), Central Valley Flood Protection Board, Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality
Development Types
Transportation:Local Road (Bridge)
Local Actions
General Plan Conformity/Initial Study
Project Issues
Air Quality, Biological Resources, Cultural Resources, Geology/Soils, Hazards & Hazardous Materials, Noise, Tribal Cultural Resources, Wetland/Riparian
Local Review Period Start
Local Review Period End

Attachments

Notice of Completion [NOC] Transmittal form

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