One of the largest and most expensive road construction projects in Iowa is being delayed because of a big mistake. A flyover bridge is being built to serve as a new exit ramp to U.S. Highway 30 for motorists heading northbound on Interstate 35 at Ames. Iowa Department of Transportation engineer Scott Dockstader says the contractor, Minnesota-based Minnowa Construction, messed up. “The bridge is being built right now and we have piers in the middle. Our contractor that’s constructing the bridge made a few mistakes with the elevation of the piers and more importantly, the anchor bolts that go into...