Buttonwood Covered Bridge

It is the shortest and most heavily used of the three covered bridges remaining in Lycoming County.

[3] The following table is a comparison of published measurements of length, width and load recorded in different sources using different methods, as well as the structural type cited.

The NBI measures bridge length between the "backwalls of abutments" or pavement grooves and the roadway width as "the most restrictive minimum distance between curbs or rails".

[1] The NRHP form measures length from "end post to end post", and was prepared by the Pennsylvania Historical and Museum Commission (PHMC), which surveyed county engineers, historical and covered bridge societies, and others for all the covered bridges in the commonwealth.

[6] The article uses primarily the NBI and NRHP data, as they are national programs.