The three-mile Grotpeter Trail in the Castelwood State Park is hilly and technical as it winds through the park's wooded uplands. It can be accessed near the first picnic shelter. A one-mile hike is also possible from this trail. River Scene Trail is a 1.5-mile loop that begins opposite the entrance road to the first picnic shelter. It ascends to the bluffs along the Meramec river, then goes down to the flood plain along the river's edge and back to the starting point. The River Scene Trail is mostly dirt, fairly flat, with several short, technical sections. The Stinging Nettle Trail, named after the plant that lines the trail, is three miles long, primarily flat with several hills. A branch off that called the Cedar Bluff Loop has a great climb to an even better view of the Meramec river valley. An integral part of Castlewood's past are the majestic white limestone bluffs that tower above the Meramec. The stately wooded bluffs are reminiscent of the turreted walls of medieval European castles. This gorgeous wilderness has attracted people for centuries. During the early 1900s, Castlewood was a premiere resort. From 1915 until about 1940, St. Louisans flocked by the thousands to the area for weekends of canoeing, dancing and sunning on Lincoln Beach along the river. During its heyday, trains deposited up to 10,000 weekenders at three small depots located at the foot of the Meramec river bluffs. A grand staircase, which still exists, guided the fun-seekers to the three resort hotels and numerous summer cabins once located in the area. The 1,779-acre park also contains a wide variety of natural habitats, including forested hills, a small stream valley, flood plain, gravel bars and the Meramec river. A flood plain forest - a rapidly vanishing feature of Missouri's landscape - is preserved here. It includes silver maple, box elder, black willow, white ash and sycamore trees. Slippery elm, white oak, northern red oak, shagbark hickory and redbud cover the uplands. Wildlife include cricket frogs, wild turkey, white-tailed deer, kingfishers and great blue herons. Initially formed by two separate land acquisitions, Castlewood State Park now straddles both sides of the Meramec river. It is also part of the Meramec River Recreation Area, which stretches 108 river miles from Meramec State Park to the river's confluence with the Mississippi river south of St. Louis. This extended recreation area includes a series of existing and proposed open spaces along the Meramec River that will someday be connected by trails. Castlewood has a little bit to offer everyone. The easy flat trails along the river offer walkers and runners a nice relaxing place to workout while heading into the hills offers a challenge in the form of huge hills, uneven footing, and fast descents. Castlewood is a place trail runners and walkers can visit for weeks at a time and find new trails each and every visit. Plus nothing beats finishing a hot summer run and soaking in the creek! Directions: Castlewood is outside St. Louis near Ballwin, along Keifer Creek Road. Take Highway 340 south until it turns into Keifer Creek Road. Go east on Kiefer Creek Road, off New Ballwin Road from Highway 100; or, from St. Louis, take 1-270 to Manchester west and turn south on Ries Road. Turn left on Keifer Creek Road and follow it to the trailhead. If you are coming from 1-44, exit at Highway 141, Meramec Station Road, go right (north). Turn left onto Big Bend. Big Bend turns into Oak Street. Turn left at Ries Road. Go over the hill and turn left at the Castlewood sign.

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