Southwest of St Louis near Jadwin, the Flat Nasty area has very challenging dirt bike riding.
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 6th most popular dirt bike trail of all 16 dirt biking rides in Missouri.