Bog Bridge, officially the Cilleyville-Bog Bridge, is a historic covered bridge in Andover, New Hampshire, spanning Pleasant Brook near the town center. Built in 1887 by local carpenter Prentice C. Atwood as a Town lattice through truss, it is one of New Hampshire’s few surviving 19th-century covered bridges and one of only two still standing in Andover. After the nearby Cilleyville Bridge burned in 1908, it gradually took on that name as the only remaining bridge in Cilleyville. Bypassed by Route 11 in 1957, it later served foot traffic, closed in 1997 for safety, and reopened in 2003 after restoration.