Hagner Avenue is incorrectly drawn - it ends at the location of this note, and the section to the east is forested land, not a road. Google Maps has it correctly drawn: https://www.google.com/maps/@38.7147004,-90.3438065,18z   and you can see the barrier at this location in Google Streetview: https://goo.gl/maps/ikNtr7mmxGU6hf2d8 