Keller's Mill Covered Bridge in Lancaster County, Pennsylvania, began as a covered road bridge over Cocalico Creek in Ephrata Township and became notable as the county's only all-white covered bridge. Built in 1873 by Elias McMellen and rebuilt by him in 1891 after flooding destroyed it, it long served as a one-lane crossing. Its single-span wooden structure used double Burr arch trusses with steel hanger rods and an oak-plank deck. When age and traffic made continued use impractical, a bypass bridge was built in 2006, and the covered bridge was dismantled, moved downstream, reconstructed, and reopened on Middle Creek Road in 2010.