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It is hard to understand the concept of "replacing" the Interstate Bridges. The concept of a tunnel to carry I-5 under the river was summarily dismissed by the bridge replacement commission (the commission's name says it all). Did anyone ever hear about the Chesapeake Bay Bridge-Tunnel, or the many tunnels under the Hudson and East Rivers in NY City? Tunnels are not rocket science and can be done if the ambition is there. An Interstate Tunnel would not displace real estate and would allow those venerable Interstate Bridges to revert to a local-use thoroughfare. Portland's Hawthorne Bridge was built at the same time (and by the same builder) as the original Interstate Bridge. It was rebuilt decades ago at a cost of $20m and will serve for many decades to come (as could the I-5 bridges as well).