On a Saturday in August, the boat ramp at Alum Creek fills up before nine. Trailers back toward the water, coolers get loaded onto pontoons, and somebody's dog is already swimming laps off the beach before the rest of the family has the car unpacked. This is the Alum Creek most of Delaware County knows: 3,387 acres of open water, the largest inland beach in Ohio, and enough boat traffic on a summer weekend that finding a marina spot takes patience.
What almost nobody launching a kayak that morning realizes is that they are floating over a town.
The lake everyone knows
Alum Creek State Park covers 4,630 acres in all, ranking among the top ten state parks in Ohio. Beyond the beach and the marina, the park carries ten miles of designated hiking trails, separate mountain bike and bridle trails, a disc golf course, and a dog park for anyone who wants to let a leash out. Winter turns the same shoreline into a different kind of destination, with the park staying open for cold-weather recreation rather than shutting down after Labor Day. In 2024 alone, the park logged roughly 45,000 overnight visitors, on top of the day traffic that fills the Below Dam Area's picnic shelters and the visitor center's 48-seat theater on any given weekend.
None of that is a secret. It is the version of Alum Creek printed on the county's tourism site and repeated in every "things to do" roundup that mentions Delaware County. What those lists tend to skip is what the reservoir replaced.
What was here before the dam
The reservoir itself is a comparatively modern feature of the county. Planning for a dam on Alum Creek began in 1956, largely as a flood control response following the completion of Hoover Dam in Westerville the year before. Before the valley filled, it held a real settlement: a community founded around 1824 when Samuel Patterson arrived in East Orange and formed a Wesleyan Methodist congregation after splitting from another congregation over disagreements about slavery. A neighbor hostile to that split's abolitionist leanings gave the settlement a derisive nickname: Africa. The name stuck, and the community became a working stop for freedom seekers moving north along Alum Creek, marked by a route locals called the Sycamore Trail, named for the pale bark of the trees that served as guideposts along the water.
When the reservoir filled, most of that settlement and the trail that ran through it went under water. It is not a story that shows up on a park map. It survives mainly through the Delaware County Historical Society's ongoing research, which has been piecing together what the valley looked like before 1956.
The mounds nobody can walk to anymore
The Africa settlement was not the only thing lost to the flooding. Seven mounds built by the Adena culture, a group that lived in the valley thousands of years ago, once stood along the creek. Archaeologists with the Ohio Historical Society, working under contract to the National Park Service, excavated five of them before the water rose: the Bagley Mound, the James Mound, the La Moreaux Mound, the White Mound, and the Alum Creek Mound. Investigators found traces of circular wooden structures at the base of several, along with artifacts and records that are now the only physical evidence those mounds existed. The ground itself is gone. What is left is what got documented in the weeks before the valley filled.
The half-mile that changed in 2024
For decades, none of this had a place to stand on. That changed in 2024, when the park opened the Heritage of Freedom Trail, a three-quarter-mile loop near the Galena Boat Ramp built along a commemorative version of the original Sycamore Trail. The trail is short by the park's standards, nowhere close to the ten miles of hiking routes elsewhere on the property, but it is doing something none of the other trails do. Historical markers and interpretive panels along the loop tell the story of the Africa settlement directly, describing the Black and white residents who worked together to help people traveling toward freedom, with a marker noting where the original community stood before the water covered it.
It is a strange kind of trail to walk. You are standing on dry ground built specifically to mark a place you cannot actually visit, because the place is now under several feet of reservoir a short paddle away.
If you are going this weekend
The Heritage of Freedom Trail is easy to fold into a normal Alum Creek trip rather than treating it as a separate destination. Park at the Galena Boat Ramp, walk the loop before the beach crowds arrive, and you are back at the water with time to spare for a swim or a launch. If you are coming from the Below Dam Area off Lewis Center Road, the park's group shelters and visitor center are close enough to combine a picnic with the walk, and the disc golf course and dog park sit within easy driving distance if you want to stretch a morning into a full day. None of it requires much planning. That is part of the point: this is not a special-occasion detour, it is a five-minute addition to a trip most Delaware County residents already make several times a summer.
What the lake actually is
Most of the county has some relationship with Alum Creek, whether that means a season pass to the beach, a standing Saturday paddle, or just knowing which exit to take when out-of-town guests want to see water. Fewer people think of it as a preservation site, because reservoirs do not look like history. They look like recreation infrastructure: a marina, a swim zone, a dog park, a scoreboard of acres and visitor counts. The Heritage of Freedom Trail is a quiet argument against that framing. It says the lake is not just where you launch a kayak. It is also where a specific community once stood, where people helped each other reach freedom, and where the ground itself still holds evidence that outdates the dam by thousands of years, even if you can no longer walk on it.
Next time you are loading the cooler at the boat ramp, it is worth the extra fifteen minutes to walk the loop first. You will still make the beach by ten.
For more on what makes Delaware County worth knowing before you need to know it, MORE Ohio keeps digging into the details that don't show up on the map.
