WB&A Trail Pedestrian Bridges, Anne Arundel County Department of Public Works
Anne Arundel County, MD

WB&A Trail Pedestrian Bridge

WBCM provided engineering design for two new bridges on the WB&A Trail, a rail-to-trail along the Little Patuxent River. The previous bridge superstructures had been completely removed and parts of the existing substructures were integrated into the design.

The first replacement bridge placed new abutments behind the existing abutments and detailed new piers to support a 207-foot through truss. The new substructure raised the bridge above the 100-year flood elevation. During construction, temporary supports and rollers were placed on the existing piers allowing the new bridge to be launched from one end.

The second bridge was a replacement for a failed concrete rigid frame over a tributary of the Little Patuxent. The replacement was a 60-foot truss designed to carry construction and maintenance vehicles in addition to the pedestrian loads. The existing piers could not be reused as part of the permanent structure because their foundations were unknown, a scour analysis could not be completed, and the County wanted the new bridge to be raised above the flood elevation, which would have required significant modifications and repairs to the existing piers. Existing high power electric transmission lines within the right-of-way complicated construction because they limited the locations where cranes could be set.

 

  • Owner:
    Anne Arundel County Department of Public Works
  • Total Construction Cost:
    $1.1 million
  • WBCM Services:
    Bridge Engineering
    Environmental Water Resources
    Site Engineering