Triple Arches

Three concrete arches frame gaps that cut across the mountainside along Going-to-the-Sun Road—one of the park's most recognized features. Built 1933-1940, the triple-arch design solves a geological problem: spanning large erosional gaps without tunneling through rock. The structure distributes its load to rock abutments, demonstrating elegant 1930s engineering pragmatism. The arches frame views of glacially-carved terrain, showing how engineering responds to geological constraints.