National Trails Highway at 10 Bridges Project; Draft Environmental Impact Report/Environmental Assessment and Draft Section 4(f) Evaluation

2 Documents in Project


SCH Number
Lead Agency
San Bernardino County
Document Title
National Trails Highway at 10 Bridges Project; Draft Environmental Impact Report/Environmental Assessment and Draft Section 4(f) Evaluation
Document Type
JD - Joint Document
Present Land Use
Existing bridges to be replaced
Document Description
The 10 bridges to be replaced along NTH are located mostly between Amboy Road and Kelbaker Road near the community of Amboy in San Bernardino County. The 10 bridges were constructed in 1930 and span over man-made ditches or “flash flood washes”. The existing bridges vary in length (40’ to 78’) but share similar construction components. The typical existing timber trestle bridges are composed of simply-supported timber stringer spans with a laminated timber deck with a concrete deck on it supported on timber strutted abutments and bents consisting of timber piles. The bridges are approximately 28 feet wide with guardrails that do not meet current AASHTO safety standards. According to Caltrans Structure Inventory and Appraisal Reports, nine (9) of the ten (10) existing bridges have a sufficiency rating less than 50 and are flagged “Structurally Deficient” (SD). The structural deficiency status is mainly due to a low superstructure rating attributable to damaged timber stringers.

Contact Information

Nancy Sansonetti
Agency Name
San Bernardino County
Job Title
Supervising Planner
Contact Types
Lead/Public Agency


Unincorporated Area
San Bernardino
Southern California
Other Location Info
Multiple locations along National Trails Highway near the community of Amboy

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, Inland Deserts Region 6 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 8 (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 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, Colorado River Basin Region 7 (RWQCB), California Transportation Commission (CATC), Colorado River Board, Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water
Development Types
Transportation:Other (Bridge replacement)
Local Actions
Project Issues
Cultural Resources


Notice of Completion [NOC] Transmittal form

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 or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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