The weakest point of a stone arch bridge of limestone is the waterline masonry, for it is prone to disintegrating in water.
The 1901 Polecat Creek Bridge is the only stone arch bridge on the NRHP in Butler County, Kansas, and its historic appearance is well maintained.
Near Cassoday, Butler County Kansas, there is an intriguing double-arch stone bridge which carries a blacktop and has a long history of modifications.
While a distorted arch in a stone bridge is not always a problem, it often points to an underlying serious trouble elsewhere within the structure.
The fill material within a stone arch bridge not only provides a roadway for vehicles, but also can strengthen the bridge… or cause trouble.
Partially collapsed arches are repairable, though such repairs tend to be involved. Of course, the cause of the collapse needs to be remedied as well.