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Supplemental Bridge with Light Rail

This alternative would involve the construction of a new bridge immediately downstream of the existing I-5 bridges. The new “supplemental” bridge would carry four lanes of southbound I-5 traffic and light rail. The existing Interstate Bridge would be re-striped into four lanes with wider shoulders for northbound traffic, and wider bicycle and pedestrian lanes would be included on the existing bridges. The existing bridges also would be retrofitted to a “no collapse” standard in the event of a major earthquake.

This alternative was added to the list of alternatives under consideration as a result of a recommendation by the Columbia River Crossing project Task Force and public input.