The Vigilante Trail
During the 1920-30s the Vigilante Trail was a primitive dirt road leading to Yellowstone Park. Adventuresome, early travelers relied on these simple hubcap-sized trail markers fastened to trees and posts, as their only guide through this wild country.
3-7-77 refers to the Vigilantes coded warning, left to encourage frontier ruffians and criminals to leave the country, or else. This warning was later incorporated into the symbol for the Montana Highway Patrol. Ask around town to find out what 3-7-77 means.