They are asking the public to submit ideas for the bridge and if yours is picked you can win money for your idea.
http://bostinno.streetwise.co/2016/03/08/northern-avenue-bridge-restoration-city-hosts-competition/
They asked for designs that pay homage to Boston, similarities to the old northern ave bridge...etc. I messed around for a while trying to draw up a suspension bridge that mimicked the x's and slanted beams on the old bridge. All of them I figured would be unnecessarily expensive and serve no structural purpose for a span this short. I eventually thought fuck it, why not say screw the old bridge (it looks like any steel bridge anywhere its not unique) and why not build a half Zakim.
A version of the Alamillo bridge in Seville Spain would look great here.
The fort point channel is kind of like a half Charles and Boston is known for the Zakim bridge so I thought why not give it a half Zakim. This would be an incredible entrance to the "innovation district", would "evoke Boston" while being unique to Boston, they are cheap to make, and the designs are well established. I think this would be the best option in my opinion. The road deck should be taller than the current bridge, possibly taller than any bridge in the channel to future proof. Also the tower portion of the bridge would add height to the gap in the skyline that the channel creates. Make the top of the tower up to the FAA max in the area or even taller if allowed. I think a mini Zakim is almost as "Boston" as your going to get. A bridge with a tall tower portion would make a great grand entrance to the channel, and in this case it is actually necessary to have.
I would say add a bike path/ped walkways on both sides of the bridge connected to an extended harbor walk, build the tower potion to the FAA max, build it with a higher road deck than what is there now, add some lighting at night, and call it a day.
I whipped up a lil render to see what it would look like. I like it, we don't have the money to get too crazy here. This is a plug and play bridge, copy and paste, save money that we don't have to burn, look good in the process, win win.
If Im not mistaken the Zakim bridge is about 260 feet. I think the FAA limit for this area is right around there so this would actually almost be perfect.