(Guard Tower #42, 1857, MI-38-30) at Jackson Maximum Facility N. of Jackson, Blackman Township, Jackson County, MI. MI106 (Cooper St.) N. 1.6 miles from jct with I94 exit 139 on the N. side of Jackson to the turret on the E. side of the road. Tower #42 is in the center of the NE wall of the facility. (N42 17.830 W84 23.184) Photo by Mark Comstock 6-5-22.