Henry L. Thiele to serve at the Eagle River mission, which included the town of Clifton at the Cliff mine.

The nearby Phoenix Mine suffered the same fate, and with almost no parishioners left, the Church of the Assumption was closed.

[5] In 1985, the church was purchased by the Keweenaw County Historical Society, which undertook an extensive restoration process.

The church is covered in clapboard, and stands on concrete block piers which replaced the original supporting posts made of mine timbers.

A rectangular-plan Gothic wooden altar stands on a platform in the front, with tiers of candle shelves behind.

A door in the center of the rear wall behind the altar leads to a small one-story hip-roof sacristy.