Bridge

Bridge

The bridge will carry pedestrians and bicyclists across I-5 between the Parkwood neighborhood on the west side and the new Shoreline South/N 145th Station on the east. The bridge will be wide enough for pedestrians and bicyclists and built to comply with Americans with Disabilities Act (ADA) standards. All bridge options will be designed to the same safety standards and include pedestrian/bicycle railings, lighting, and screening (throw barrier) to protect drivers on the interstate below from falling objects.

Option 1: Combined Arch Bridge

Image looking north at Combined Arch Bridge over I-5.
Click here to enlarge.

  • Design: The combined arch bridge would have a major arch over I-5 and smaller arch on the short connection to the trail on the west side of the bridge.
  • Size: The arches would have steel support pieces overhead and vertical support pieces that could be cable or steel.
  • Safety: The throw barrier would be attached to the inside of the vertical support pieces to prevent things from falling onto the interstate below.

Option 2: Tied Arch Bridge

Image looking north at Tied Arch Bridge over I-5.Click here to enlarge.

  • Design: The tied arch bridge would have two side-by-side arches titled toward each other with attached supporting cables.
  • Size: The higher arch and slender cables would create more space and light than the other bridge options.
  • Safety: The throw barrier could be attached on either side of the cables to prevent things from falling onto the interstate below.

Option 3: Truss Bridge

Image looking north at Truss Bridge over I-5.Click here to enlarge.

  • Design: A truss bridge has connected pieces that form a triangle or “truss.”
  • Size: Compared to the other bridge types, the truss bridge would be slightly shorter at its highest point, have more structural pieces overhead, and the outside supports would be wider.
  • Safety: The throw barrier would be attached to the inside of the trusses to prevent things from falling onto the interstate below.

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Share your thoughts on bridge design options:

Bridge

Option 1: Combined Arch Bridge

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Option 2: Tied Arch Bridge

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Option 3: Truss Bridge

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Summary

Which bridge option do you prefer?

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