(Guard tower, 14', c1950, MI-38-24) 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 bldg on the E. side of the road. (N42 17.619 W84 23.560) Photo by Mark Comstock & Jennifer Tasker 5-8-22.