Vermont is home to more than 100 covered bridges, boasting more covered bridges per square mile than any other U.S state. The bridges date from 1820 (the original Pulp Mill Bridge across Otter Creek in Middlebury), with most constructed during the mid and late 19th Century. Locations of the bridges are indicated with symbols on the Vermont Road Map. Among them is the Windsor Cornish Covered Bridge that spans the Connecticut River between Windsor, Vermont and Cornish, New Hampshire. At 465 feet, it is the longest two-span covered bridge in the world and the longest wooden bridge in the United States.