John W. Boardman
1958(Rhenania Junior RJ-235)
- Type: Great Lakes bulk freighter
- Displacement: 5,500 tons
- Dimensions: 350 x 55 x 28 ft.
- Machinery: = knots
- Service: Built for Huron Transportation Co., the first Great Lakes ship built to handle cement in bulk. Taken over by National Gypsum and renamed Lewis G. Harriman in 1965. The forward section is now a cabin at DeTour, Michigan.