The Carroll County Board of Supervisors Monday took steps toward development of two new bridges and three concrete box culverts on county gravel roads.

The work is expected to be complete this year at an estimated cost of $783,000, said County Engineer Dave Paulson.

Supervisors approved a Feb. 11 bid-letting date for a slab bridge on Kittyhawk Avenue, 1 mile north of Mount Carmel between 140th Street and 120th Street. The estimated cost is $250,000.

The board also will take bids on three concrete box culverts in the following locations: Birch Avenue near Manning between 280th Street and 290th Street at an estimated cost of $120,000; north of Arcadia on Birch Avenue between 160th Street and 170th Street at an estimated cost of $83,000; and southeast of Lidderdale on Robin Avenue between 170th Street and 180th Street.

All projects will be financed with county money and are expected to be completed by July 1.

They will replace narrow, outdated bridges or ones with structural problems, Paulson said.

"It's their time to go," Paulson said.

In separate action Monday, the supervisors entered into a federal-aid agreement for construction of a slab bridge on 290th Street north of Manning that traverses "Unnamed Creek," a tributary to the Nishnabotna River. The funding split is 80 percent federal and 20 percent county with a bid-letting on June 18. Paulson said the project is scheduled for completion in 2013. Cost estimate is $250,000.

"I think it could be down in the $200,000 range pretty easily," Paulson said.