The Keller's Mill Covered Bridge is a covered bridge that spans Cocalico Creek in Ephrata Township, Lancaster County in the US state of Pennsylvania. A county-owned and maintained bridge, its official designation is the Cocalico No. 5 Bridge. It is also sometimes known as Guy Bard Covered Bridge (after a local jurist) and Rettew's Covered Bridge (after the person that Rettew's Road is named).[3]