Bolles Flour Mill

Historical marker location:

Afton, Minnesota

( Marker is on Saint Croix Trail North (County Highway 18 / 21) 0.3 miles north of Stagecoach Trail South (County Highway 21), on the right when traveling north.)

Marker installed: 1959

The first successful open-heart surgery was performed in 1952 at the University of Minnesota by Dr. C. Walton Lillehei.