National Boards > Bridges
Bridges replaced directly next to the old one
fillup420:
North Carolina seems to have a thing for this. I drove up NC 49 the other day and noticed NCDOT had replaced a small creek bridge by building it next to the old one, and then slightly rerouting the roadway. to me it seems like an overkill way to replace a bridge. yall know of any more examples like this?
MikeTheActuary:
Well, there's the Tappan Zee outside New York City, the Pont Samuel-de Champlain in Montréal....
It's a fairly common tactic, I think.
wanderer2575:
I'd guess it's usually done to avoid the lengthy detours of a total road closure.
Or the bridge is retained for historical significance or recreational value. When MDOT constructed the current US-12 bridge over the St. Joseph River in Mottville MI, it kept the previous narrow camelback bridge and the old highway alignment west of it was made into a small park.
Google Maps link: https://goo.gl/maps/9Y4gJGFjRGPTwevM7
Max Rockatansky:
Pretty much every modern bridge on US 1 in the Florida Keys.
jeffandnicole:
Yep, this is done quite often. When the roadway is slightly shifted to the new bridge, it can often be done so that most motorists aren't even aware of the slight shift.
For smaller overpasses, most of the NJ Turnpike overpasses that have been rebuilt were rebuilt right next to the original bridge, sometimes within a foot of the old bridge.
It's also common to build half of the new bridge just slightly off the current alignment. When the old bridge is demolished, the remaining half of the new bridge is built in the vicinity of the old bridge. Such is going on here at an old lift-bridge on US 130 in NJ: https://goo.gl/maps/teBqz8PkcSmJGuTp8 . The lift bridge formerly held 4 lanes, no shoulders. The new SB overpass has been built here right next to the lift bridge and currently is hosting one lane per direction. You can see the new bridge supports going up right where the lift bridge is located, which will eventually be for the Northbound lanes. In the end, the new bridge will have 4 lanes and full shoulders.
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