(Roundhouse, 18', 1855, MO-92-05) in St. Charles, St. Charles County, MO. 5th St. N. 1.3 miles from jct with I70 exit 229 in St. Charles, W. on Clark St. (MO94) 0.2 miles (3 blocks), N. on 2nd St. (MO94) 0.1 miles to the bldg on the E. side of the road. (4-5-06, N38 47.20 W90 28.81) Photos by Jack Schmidt.