The Mull Covered Bridge was built in 1851 by the Henry Mull Family to provide safe passage across Wolf Creek and easy access for trade to the Mull mill. It remained open to traffic until 1962, when the road was diverted and a new bridge was constructed, after which it was listed on the National Register of Historic Places. More than 10,000 covered bridges were built in the U.S. between 1805 and the early 20th century, and today fewer than 900 remain, mostly in Pennsylvania, Ohio, Indiana, and Vermont. Covered bridges have long inspired feelings ranging from nostalgia and romance to ghost stories. Explanations for covering bridges include sheltering travelers from bad weather, keeping horses from being frightened by the water, and, most popularly, protecting the bridge itself from damage caused by rain, ice, and snow, since repairing a roof was easier than replacing an entire span. Another explanation points to the fact that almost all covered bridges were built in the North, where icy bridges would have been dangerous. The Mull Covered Bridge was built using the Town Truss design and stands as a reminder of a quieter, simpler era of history.