[someone123]

Interesting find. Thanks for posting.

These don't really seem like different alternatives to me unless they were thought of as a way to serve newly-developed suburbs. There are the MacKay type options and then the Northwest Arm options.

I think the eventual MacKay alignment was the most attractive of those options.

I still think a Northwest Arm bridge would be good. It's common to hear people talk about how they are so politically infeasible because they will require huge expropriations but the map shows how minimal that disruption would be. Particularly the Robie option, which would be a huge improvement to the transportation network but only affects a few houses.