Jeff Grigg from Manchester, MO on 10/5/2008 9:03:25 PM:
This is the turnoff:
http://maps.google.com/maps?f=q&hl=en&geocode=&q=38.66172,+-90.74466&ie=UTF8&ll=38.661721,-90.744667&spn=0.025401,0.055618&t=h&z=15
or:
http://tinyurl.com/53jcc6
If you get to "Highway DD" (while going West), then you've gone too far.