This bridge is a massive through truss. It was designed by famous engineer Ralph Modjeski and is among the earlier of his surviving bridges. The bridge was originally designed to handle railroad traffic, but today only serves vehicular traffic plus a bicycle path. Not part of the original design, there are extra decks cantilevered outside of the truss lines on each side. Although both appear capable of handling a single lane of highway traffic, the south outer deck is now used for the bicycle path, while the other side is closed but appears to be intended for use for detours when the main two lanes between the truss lines are closed for repair. The approach spans for this bridge are all two lanes only, with the cantilevered lanes on the truss ending after the truss spans.
The original approach viaduct for this bridge has been demolished and replaced, with the exception of a section of railroad viaduct which was converted for use on the bike path. The original approach included large deck truss spans that were replaced with steel stringer spans. Historical photos below show the original design and layout of the bridge.
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