Longitudinal cracking is a common defect on stone arch bridges. While often not overly serious, under the right conditions this cracking can indicate a major problem.
Before Cowley County, Kansas began building its famous stone arch bridges in earnest, the city of Winfield built one at the entrance of Island Park.
Walter Sharp, the famous stone arch bridge builder of Cowley County, Kansas, had a secret to building stone arches quickly and inexpensively.
The spandrel walls hold the fill of a stone arch bridge, and need to be correctly engineered to do so without gradually bulging and failing.