Would it be any less disruptive than digging a tunnel underneath? I can see that being a bigger deal, having to get truck after truck there to haul away the dirt they pull out of the ground, having to get concrete trucks and staging built for the tunnel walls. Possible weight restrictions on the road while the tunnel is being dug.
With a bridge you have piers being built, and then beams put into place at night. Having seen SE Stoney being built, one single bridge wouldn't be that bad. Plus it would only be for a year or two.
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