GPC 22-11 Wolf Creek Road over Wolf Creek Bridge Replacement Project


SCH Number
Lead Agency
Lake County
Document Title
GPC 22-11 Wolf Creek Road over Wolf Creek Bridge Replacement Project
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Road with bridge
Document Description
The bridge has a sufficiency rating of 60.1 and has been designated as functionally obsolete per the Caltrans Structure Maintenance & Investigations, Local Agency Bridge List (July 2015). The functionally obsolete designation is a result of the insufficient deck width. Wolf Creek Road is a two lane road and the clear width of the existing bridge is too narrow to support standard lane and shoulder widths for a two lane facility. Additionally, the existing bridge fails to meet the current Caltrans design standard for freeboard requirements. Hydraulic studies indicate that the existing bridge may be overtopped during a 100-year storm event. 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 American Association of State Highway and Transportation Officials (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 5-foot sidewalk (Lake County standard) will also be proposed on the north side of the replacement structure to accommodate school children accessing a nearby bus stop. The replacement bridge will be approximately 84 feet long. This length is appropriate for a single span bridge, which would reduce the construction duration and increase the hydraulic capacity of the channel. 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 material is 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.

Contact Information

Katherine Schaefers
Agency Name
County of Lake
Job Title
Resource Planner
Contact Types
Lead/Public Agency


Parcel #
062-101-01, 062-092-03, 062-102-01
Other Location Info
Bridge No. 14C-0049 is located in unincorporated Spring Valley in Lake County, approximately 5.4 miles northeast of State Route 20; Quad: Benmore Canyon T14N, R07W, Section 11 UTM Zone 10 (39.082336, -122.604181)

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 State Parks, Division of Boating and Waterways, 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), Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, Central Valley Flood Protection Board
State Reviewing Agency Comments
Central Valley Flood Protection Board
Development Types
Transportation:Other (Bridge)
Local Actions
General Plan of Conformity
Project Issues
Air Quality, Biological Resources, Cultural Resources, Hazards & Hazardous Materials, Hydrology/Water Quality, Noise, Transportation
Local Review Period Start
Local Review Period End


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

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