EIS Archive


The Environmental Impact Statement (EIS) for the Portal Bridge Capacity Enhancement Project examined a number of “Build” alternatives, as well as a NEPA-required “No Action” alternative. The Build alternatives included a number of options -- and variations within each option -- to improve the aging bridge. Alternatives evaluated modification or rehabilitation of the existing bridge (including raising the existing structure’s height) along with the construction of an entirely new bridge(s) with varying proposed heights, operation type (moveable/fixed) and number of tracks.

The Alternatives Screening Report describes the process by which the many alternatives considered were narrowed down to those presented in the Draft Environmental Impact Statement (DEIS).

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