Our main business is building bridges, but over the years we have expanded to include box culverts, design-build, retaining w ... alls, soil stabilization, equipment and sheeting rental, barrier rail, water reservoir renovation, sheet pile and H-pile driving, railroad work, concrete and asphalt disposal, recycling, and retail, emergency repairs, and demolition. We are a multi-state, heavy highway construction firm working in the Midwest, South and Southeast regions of the U.S. Please utilize our website, www.unitedcontractors.net, or contact Paul Mowery at 515-276-6162 or paulmowery@unitedcontractors.net. read more