 The highway was designated in the mid-1930s at about the same time a number of similarly-numbered highways, SR 370, SR 371 and SR 372, were created.All of these routes share a common bond in that they were established specifically to serve state parks and state forests.However, unlike the other three routes, which are all spurs, SR 373 is a loop route that intersects SR 93 at both endpoints, while providing access to Dean State Forest.