Originally Posted by fusili
Pretty much. But it is better to start elevating as quick as possible rather than go under the river and then have an even larger grade to climb after the river. My prediction is a tunnel/bridge transition in Prince's Island, then a bridge over the river/memorial to a portal in the bluff. Then a tunnel until 16th street and then elevated again.
I'm curious about the engineering hurdles involved in a tunnel portal in the bluff which we've all been told is unstable. It might make sense to keep it lower, in a more stable substrate, until past the point of erosion risk. That could mean bored tunnel until just past 16 Ave.
I'm also not too sure how elevated would go over. I think there will be a big debate between cut and cover and elevated (I just don't see anything in street being viable for the required capacity) and the end result will depend on how much more expensive cut and cover is and how much opposition to elevated there is. Personally, I favour cut and cover all the way to Beddinton Trail but a huge price tag (ie, more than a billion in price differential) could easily change my mind.