Las Trampas Creek Bridge at South Main Street Replacement Project


SCH Number
Lead Agency
City of Walnut Creek
Document Title
Las Trampas Creek Bridge at South Main Street Replacement Project
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Pedestrian Residential (P-R) and Mixed Use-Commercial (MU-C)
Document Description
The existing five-span bridge would be replaced with a new two-span precast-prestressed voided concrete slab bridge. The bridge would be replaced in two phases, Phase 1 would construct the Pedestrian/Utility Bridge and Phase 2 would construct the Replacement Bridge which would require closing South Main Street. The proposed pedestrian/utility bridge would be approximately 105-ft long and provide a 10-foot-wide pedestrian path. The proposed vehicular bridge (Replacement Bridge) would be 104 feet long and approximately 92 feet wide including barriers, one 10-foot sidewalk in compliance with the Walnut Creek Pedestrian Master Plan design guidelines for the Core Area Zone, and one 4-foot-wide median. The bridge would convey vehicular traffic on four 12-foot through lanes and a left-turn lane that would vary in width. The proposed vertical profile is planned to be similar to the existing profile to minimize cut/fill requirements adjacent to the proposed bridge. The proposed roadway approaches are planned to be slightly realigned from their existing condition between the intersections at Botelho Drive and Broadway Plaza to conform to the new bridge width. Improvements to the north and south roadway approaches are anticipated to be less than 200 feet long on either side of the proposed bridge.

Contact Information

Neil Mock
Agency Name
City of Walnut Creek
Job Title
Project Engineer
Contact Types
Lead/Public Agency

Edward Heming
Agency Name
LSA Associates Inc.
Job Title
Contact Types
Consulting Firm


Walnut Creek
Contra Costa
Cross Streets
Botelho Drive and Newell Avenue
Total Acres
Parcel #
State Highways
SR-24, I-168
Las Trampas 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 Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Parks and Recreation, California Department of Resources Recycling and Recovery, California Department of Transportation, District 4 (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, 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, Division of Water Rights
Development Types
Transportation:Other (Bridge Replacement)
Local Actions
Bridge Replacement
Project Issues
Aesthetics, Air Quality, Biological Resources, Cultural Resources, Geology/Soils, Hydrology/Water Quality, Noise, Transportation, Wetland/Riparian, Wildfire
Local Review Period Start
Local Review Period End


Notice of Completion [NOC] Transmittal form

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