Southwest of St Louis near Jadwin, the Flat Nasty area has very challenging OHV driving.
To reach the park from Rolla, head south on SR72 to Salem. Continue south on SR19 to K. Head west on K to ZZ. Turn right heading north on ZZ for 1 mile. Flat Nasty is on the right.
Overall, Flat Nasty is the 2nd most popular OHV & 4wd jeep trail of all 6 OHV routes in Missouri.