The project will take 4 to 5 years to build. During that time we can expect the greatest impact on South Nyack to be construction noise. Obviously, those closest to the highway will be most affected by this. The existing noise barrier along the north side will be taken down in order to widen the highway, so it will certainly be noisier until the new wall is in place.
They will be driving large steel piles into the riverbed to support the new bridge. The pounding may be quite loud. They will be driving test pilings as soon as March, so we will soon get a taste of how loud this will be.
There will be a lot of activity at the base of the bridge on the river shoreline. A large platform will be built out into the river for construction barges.
Truck traffic is supposed to be contained to the Thruway itself, using the maintenance access ramps to River Road.
Current plans for the replacement of the South Broadway overpass keep the existing overpass open to traffic until the new overpass is in place. There may be some temporary closures.