Harringworth viaduct crosses the valley of the River Welland between Harringworth in Northamptonshire and Seaton in Rutland. The viaduct is 1,275 yards long and has 82 arches, each with a 40 feet span. It is the longest viaduct across a valley in the United Kingdom. Built by the contractor Lucas and Aird, a total of 30 million bricks were used in the viaduct's construction. It was completed in 1878. The viaduct is on the Oakham to Kettering line between Corby and Manton Junction, where it joins the Leicester to Peterborough line. It is listed Grade II.