Shadow Cliffs to Arroyo del Valle Trail

Design Feasibility of a Pedestrian Bridge Crossing at a Regional Park.

WRA informed the feasibility for the design of a pedestrian bridge crossing of the Arroyo del Valle creek in Sycamore Grove Regional Park in Livermore, California.  Construction of this bridge will complete a critical piece of the Shadow Cliffs to Del Valle Regional Trail and provide a permanent crossing of the creek within the park.  A conceptual design was arrived at through field investigations, preliminary design calculations, and input from project stakeholders, including the East Bay Regional Park District, the Tri-Valley Conservancy, the Livermore Area Recreation and Parks District, and the City of Livermore.  WRA staff provided biological, permitting, environmental planning, and landscape architecture expertise for this project:

  • Evaluated bridge alignment alternatives in light of programming issues and site-specific constraints and opportunities. We produced drawings and a cost estimate of the proposed bridge alignment.
  • Identified potential biological resources that could be affected by the construction and operation of the proposed bridge based on existing data and field reconnaissance.
  • Identified the regulatory requirements for the proposed bridge alignment.
  • Completed the environmental review process and acquired the required regulatory permits for the project.
  • Conducted compliance and biological monitoring during construction.


  • Feasibility for a bridge crossing in a regional park


  • Public Trail and Bridge Alignment Alternatives Plan
  • Design Support for Grading, Revegetation, and Trail Improvements
  • Rendering of Bridge Design
  • Jurisdictional Wetland Delineation, Biological Resources Assessment, and Rare Plant Survey Reports
  • Arborist Survey
  • Initial Study/Mitigated Negative Declaration
  • Authorizations from U.S. Army Corps of Engineers, Regional Water Quality Control Board, and California Department of Fish and Wildlife