Stone Arch Bridge - Mississippi National River and ...
Feb 27, 2020· The Heritage Trail is a two-mile trail with an extensive system of interpretive and directional signs and kiosks. The Stone Arch Bridge is the only bridge of its kind over the Mississippi River. It is made of native granite and limestone, and measures 2100-feet long by 28-feet wide. The bridge consists of 23 arches, and spans the river below St ...