128 Hopper Slough Bridge Replacement Project

Hopper Slough Bridge (BR# 21-0019) Napa County Route 128 PM 5.12

Work Description

  • Replace non-standard existing bridge to ensure continued operation of the highway and safety of its users.
  • There is no change in the alignment of the roadway and the existing bridge will be demolished in one stage.

 

128 Hopper Slough Bridge Replacement4J830 Map 

 

Hopper Slough Bridge Alternative 1

  • Proposed full closure of the bridge during one season. The existing bridge will be demolished and removed in one stage.

  • This alternative will decrease the construction time and cost and reduces the construction foot print.

  • Two alternative detour routes are developed, both detours are on existing pavement.

Option 1

  • Proposed four feet shoulders

Option 2

  • Proposed six feet shoulders

Option 3

  • Proposed eight feet shoulders

Hopper Slough Bridge Alternative 2

  • This alternative proposes a temporary one lane modular steel bridge with temporary abutments will be constructed off-season. The temporary bridge will be signalized to allow for one-way traffic control.

  • Additional temporary easement will be required for the contractor to stage equipment and materials. Proposed staging area is located on the unpaved area north of the bridge.

Option 1

  • Proposed four feet shoulders

Option 2

  • Proposed six feet shoulders

Option 3

  • Proposed eight feet shoulders