The 250-foot (76 m) manmade tunnel allows hikers to avoid a strenuous climb over very steep terrain between Many Glacier and the Belly River valley.

Two opposing steel jackhammers drilling from either side of the tunnel and a series of ten-hole rounds of dynamite gradually broke through the mountain in less than three months.

A wide area, originally for guide and tourist horses, extends from each portal with a masonry retaining wall.

Heavy iron doors were hung across the tunnel adits during the summer of 1975.

This article about a property in Montana on the National Register of Historic Places is a stub.