Castlewood State Park
1401 Kiefer Creek Road
Ballwin, MO 63021
(636) 227-4433 (Park Office)
Amenities: Fishing and boating in the Meramec River; there are eight hiking, eight mountain biking trails and three trails open for equestrian use; two picnic shelters and 50 picnic sites throughout the park; swimming is at your own risk.