A new viaduct is under construction in North Platte.
Crews began hauling in equipment this week for the Birdwood Viaduct and other workers had already started surveying welding and digging.
The overpass is just west of the union pacific railroad's bailey yard and will offer another entrance and exit to North Platte.
Union pacific will pay up to $4.3-million of the cost and Lincoln County will pay a maximum of about $500,000.
The state will cover the remaining costs.