Courtesy of the Mayor’s office, here is the presentation (PDF, 1.8M) of the URS Columbia River Crossing analysis and alternatives that was presented to the Portland Freight Advisory Committee last week.
We also have a full-size PDF map (3.4M) of the combined Marine Drive/Hayden Island interchange. The key idea seems to be to use a small bridge across the slough to access Hayden Island from the freeway, rather than on-island ramps.
Another intriguing feature is keeping MAX and bikes on a separate structure across the slough. Apparently there is some discussion of continuing this on to Vancouver and building it before the bridge replacement to provide a travel alternative during bridge construction. What a wonderful idea… train all those commuters to use MAX!