Southwest of St Louis near Jadwin, the Flat Nasty area has very challenging ATV riding.
To reach the ATV riding trails at Flat Nasty 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 5th most popular ATV riding trail of all 13 ATV trails in Missouri.