The name of the boat is the Sinopah formerly Little Chief and it is on National Historic Registry Registry this year:
Operating in Glacier National Park since its construction in 1926, the 45-foot long by 12-foot wide carvel planked cedar on oak frame vessel Little Chief took its name from a prominent mountain along the south shore of St. Mary Lake where the boat was originally launched. The Great Northern Railway commissioned and owned the Little Chief, operating it as transportation for its customers from the St. Mary Chalets up the lake to the Sun Point Chalets. The boat was rechristened Sinopah sometime during the 1940s when it was relocated to Two Medicine Lake where it continues to operate for scenic cruises every summer.

Despite years of service in the lakes of Glacier National Park, integrity of materials remains strong on the Sinopah, the registry notes. Although some materials were replaced for maintenance during its historic use, these occurred to allow the boat to function in its original historic capacity. The deckhead, originally 2-inch tongue-and-groove boards, was replaced in the past with plywood attached on top of the beams and carlings.

This will be rectified and returned to its original appearance within two years during maintenance roof work when the canvas roof covering will be replaced; at that time, the plywood will be removed and exchanged with local cedar tongue-and-groove boards to reflect the original design. Original windows were replaced with aluminum frame glass windows into the original oak post frames; however, these replicate the originals. The original 200 horsepower gasoline engine was replaced with a safer more efficient 50 horsepower diesel motor mandated by the National Park Service and U.S. Coast Guard.