Why this park
Old Stone Fort keeps 782 acres just west of Manchester, in Coffee County. At its heart is a narrow tongue of high ground. The Duck and the Little Duck run in gorges on either side and join below its tip, and both drop over falls on the way: Big Falls, Blue Hole Falls and Step Falls, all seen from the loop trail around the walls.
What makes the place worth drawing is that line of low walls along the bluffs. Starting about 2,000 years ago, people heaped stone and earth around some 50 acres, left gaps where the cliffs needed no help, and built an entrance between two mounds, with inner walls that seem to point to the summer solstice sunrise. Its name calls it a fort; the evidence says it never was one.
The story
The Tennessee Encyclopedia describes the walls as rough stone, stacked or piled, then covered with earth, once four to six feet tall and about 4,600 feet long if laid end to end. The entrance had a ditch, a mound on each side and two parallel walls leading inward to a dead end.
That entrance persuaded early historians it was a fortress, built perhaps by Welsh or Norse explorers or by Hernando de Soto's soldiers. Excavation ended those stories. In 1966 a University of Tennessee team that included Charles H. Faulkner dug trenches and test pits. Radiocarbon dates from the walls ran from A.D. 30 to 430, Faulkner wrote in the site's National Register nomination. The Tennessee Encyclopedia's later article sets the building between about A.D. 80, when the entrance ditch was cut, and 550.
The encyclopedia credits two peoples of the upper Duck valley, the McFarland culture and the Owl Hollow culture. The first seems to have begun the enclosure and the second to have finished it. Both were in contact with the Hopewell people of Ohio, builders of similar hilltop enclosures, such as Fort Ancient, in the same centuries.
It was no fort, the excavators reasoned: it rose over generations, its walls are too low to defend, and digging found few artifacts and few signs of houses. The encyclopedia says archaeologists now have little doubt it was sacred ground, though just what ceremonies it served is unclear. The newest hypothesis it reports, since the entrance walls seem to line up with the solstice sunrise, is that the site was a kind of observatory. That remains an idea, not a finding.
Much later the rivers' power drew mills to the gorges, and during the Civil War a mill here made gunpowder for the Confederacy. The Stone Fort Paper Company put up a big mill at Big Falls in 1879; its stone foundations still stand above the falls. In 1966 the state bought 400 acres from the Chumbley estate to form the park's core, and the park dates its founding to that year. The enclosure was listed on the National Register in 1973.
When to go, and what to wear
Spring is mild and wet. At NOAA's Manchester station, about 2.5 miles away, April averages a high near 69°F and a low near 43°F. March, at about 6.4 inches, is the second-wettest month: pack a rain shell, and stay out of the rivers after heavy rain, when the park says they can rise. Trails are mostly dirt, with roots, stairs and rock steps up to 13 inches high; wear shoes that grip.
Summer is for the water. July averages a high near 86°F and a low near 65°F. Step (or Little) Falls is the park's most popular spot to swim and fish, but jumping off the bluffs or falls is forbidden, and the park advises that children under 10 not climb down the bluffs. The hilltop inside the walls is open grassland: bring a hat and water. Ticks are most active from April through September, the CDC says, so use a repellent such as DEET or picaridin and check yourself afterward. A light long-sleeve tee helps with sun and ticks alike.
October is the driest month, at about 3.5 inches, with highs near 71°F and lows near 44°F. January averages a high near 47°F and a low near 26°F, and December, at about 6.6 inches, is the wettest month. The campground's showers close from December through February. Dress in layers: a long-sleeve tee, a sweatshirt, a windproof jacket and a hat.
Know before you go
- The park's page, read on November 5, 2026, says its bridge is closed to cars and walkers during construction, with no reopening date. TDEC said in October 2025 that the truss bridge over the Duck River, the campground's link to the main park, was declared unsafe for cars in April 2020, that campers use Country Club Drive instead, and that work on a new bridge would begin October 20, 2025.
- Stay on marked trails and off the walls; the park has laid natural materials across parts of them to turn walkers away.
- Fires go only in the grills and fire rings at the picnic area and campground. Mountain bikes may use only the 1.7-mile Powerline Trail, and riders under 16 must wear helmets.
- Hours, fees and closures change, so check Old Stone Fort State Archaeological Park's page before you go.
Sources: Tennessee Encyclopedia, "Coffee County" (Carroll Van West) and "Old Stone Fort State Archaeological Park," Tennessee Historical Society; National Park Service, National Register of Historic Places nomination, "Old Stone Fort" (Charles H. Faulkner, 1972); Trish Milburn, "Old Stone Fort State Archaeological Park," The Tennessee Magazine (August 2022); Sara Hook, "Old Stone Fort Archaeological Park," Good News Exchange, Manchester (June 2022); Susan Campbell, "Feature Friday: Friends help protect, preserve Old Stone Fort State Park in Manchester," Thunder Radio (August 13, 2020); Tennessee Department of Environment and Conservation, news release of October 17, 2025, as printed in the Cannon Courier; Centers for Disease Control and Prevention, "Preventing Tick Bites"; NOAA, U.S. Climate Normals 1991–2020, Manchester #2 station; Wikipedia; Old Stone Fort State Archaeological Park, tnstateparks.com.
