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The proposal by the Mayor of Seattle and Governor of Washington was to have I-5 go underground at the cliff-face by Jackson st [here](http://maps.google.com/maps?q=47.599218,-122.320282&ll=47.598871,-122.31843&spn=0.016726,0.030856&num=1&t=p&z=15), following underground at roughly Broadway, until just past Mercer St [roughly here](http://maps.google.com/maps?q=47.627975,-122.326805&ll=47.62676,-122.324224&spn=0.016718,0.030856&num=1&t=p&z=15) where it would rejoin what actually got built.
By the time they started building the Interstate in Seattle they could already see the damage it was doing to cities like New York and Boston and badly *badly* didn’t want it to happen to Seattle. The federal government ultimately overruled them, settling on the rout that divided the city and destroyed the only neighbourhood to survive the Great Fire.
Edit: They scrapped a few other highways successfully though.
* I-90 was supposed to connect to the Alaska Way Viaduct [here](http://maps.google.com/?ll=47.59365,-122.335356&spn=0.000739,0.000964&t=h&z=20) where you see the nubs.
* Also there was supposed to be a cliffside parkway along the south-western quarter of Lake Washington that would ultimately dead end [here](http://maps.google.com/?ll=47.644321,-122.296865&spn=0.004207,0.007714&t=h&z=17) where you see the completed intersection that’s only half used today.