The Wilson's Mill Covered Bridge is a historic covered bridge in Avella, Pennsylvania. It is designated as a historic bridge by the Washington County History & Landmarks Foundation. References External links [ National Register nomination form] Covered bridges on the National Register of Historic Places in Pennsylvania Covered bridges in Washington County, Pennsylvania National Register of Historic Places in Washington County, Pennsylvania Road bridges on the National Register of Historic Places in Pennsylvania Wooden bridges in Pennsylvania King post truss bridges in the United States