Rocky Fork Lake

At a glance

Before the lake

Rocky Fork Creek runs through a valley that was reshaped more than 12,000 years ago, when glacial ice blocked its course and forced the stream to cut rapidly through rock, carving a 75-foot gorge. That gorge later held the "Rocky Fork Caves," also called the "Bainbridge Caves" and known today as the Seven Caves — a genuine 19th-century tourist draw, not a modern invention. Newspaper notices from the West Union People's Defender trace the site back to at least 1882, when "parties on their way to the Rocky Fork Caves" were already a common sight. By 1894 the Ohio Southern Railroad was photographing the "grand scenery" there for its own advertising, and boosters were arguing the caves could make Bainbridge "one of the best health resorts in the country." Local social notices still placed young couples spending "Saturday at Rocky Fork caves" as late as 1917 — decades before anyone talked about building a lake.

Inside what is now the park, a hilltop south of the creek holds the Rocky Fork Park Site, a pair of concentric circular earthworks built by Hopewellian people sometime before around AD 700, likely for ceremonial use. The site survived because the surrounding land was cleared for pasture but never plowed. It was added to the National Register of Historic Places on June 18, 1973 (reference #73001479), one of only four Highland County listings, alongside a related mound group known as the Rocky Fork Park Group.

The valley's economic life for a century and a half centered on a single millsite about 300 yards downstream of where the dam now stands. David Reece bought 250 acres there in 1824 for $500 and built a sawmill and gristmill by 1829-1830 (one later account puts the mill's founding as early as 1810). Reece represented Highland County in the state legislature before he died in 1841. In 1848, Henry Stacy Foraker bought and rebuilt the mill — and moved in with his two-year-old son, Joseph Benson Foraker, who lived there for thirteen years before growing up to become Ohio's governor, twice, and a United States senator. The mill later passed through owners named Newell, Costello and, in 1906, John Allen McCoppin, a Hillsboro hardware merchant who spent $12,000 modernizing it with an Allis-Chalmers roller mill. The Sydenstricker family ran it last, from 1952 until 1979, closing out more than 150 years of continuous milling on the site. A separate mill on the same creek, Beaver's Mill, had its own 122-foot covered bridge, built in 1872 and torn down in 1955; a Depression-era federal survey counted at least six water-powered mills once operating along Rocky Fork Creek.

Otherwise the land that became the lakebed was ordinary Highland County farmland.

Building the dam

The idea for a lake here is credited to Colonel Walter H. Hutchins of Cincinnati, a frequent visitor to the Rocky Fork gorge around the turn of the 20th century who dreamed of a reservoir near McCoppin's Mill. It took roughly half a century for that dream to become real: Ohio's Division of Conservation didn't acquire the land until the 1940s, and construction didn't start until 1949, when timber clearing began. Rocky Fork joined the Ohio state park system in 1950, before the dam itself was even finished. Dam construction proper began around 1951 (one source instead describes the creek as "impounded" that year, which may mean something slightly different from full completion), and water first spilled over the dam in April 1953. The first boat-launch facilities, North Beach and a ramp known only as "Blinco," opened in 1954.

Sources describing the taking are thin. No source found gives an acreage figure, dollar total, or the name of a single bought-out family for the original 1940s-50s acquisition — a genuine gap, likely because this was a state Division of Conservation project rather than a federal U.S. Army Corps of Engineers project, and so never generated the kind of design-memorandum paper trail that federal reservoirs typically leave behind. What is known is that the lakebed was mostly farmland, with tree stumps left standing in the shallower upper reaches after the 1949 clearing — evidence the clearing wasn't fully finished before the water came in. No record of a cemetery relocation, positive or negative, was found. McCoppin's Mill itself was spared: preservationists specifically chose to let it stand rather than tear it down, and it remains today, vacant, about 300 yards downstream of the dam.

At least one worker died before the lake was finished: Jerry McCoy drowned during construction, caught unaware by dredging operations underway in the valley. His exact date of death was not found.

The finished dam is a 74-foot, 380-foot-long concrete gravity structure using about 30,000 cubic yards of concrete, with a 154-foot spillway, built explicitly, in the state's own words, "for recreational purposes and economic development" — not flood control, a real contrast with the federal reservoirs built nearby on Paint Creek and Deer Creek.

Stories

The senator who grew up at the mill

Joseph Benson Foraker was two years old in 1848 when his family moved into the mill on Rocky Fork Creek. He later described his boyhood there as that of "a typical farm boy," with only three or four months of schooling each winter. He went on to serve as governor of Ohio twice and then as a United States senator, one of Ohio's most prominent Republican politicians of the era. Decades later, when the state built its dam roughly 300 yards upstream, preservationists deliberately let the mill stand rather than let the lake swallow it — so the building that shaped a future senator's childhood still sits within sight of the reservoir that remade the valley around it.

The caves before the lake

Long before anyone proposed a dam, the gorge downstream was already a destination. Nineteenth-century newspaper notices call it the "Rocky Fork Caves" and the "Bainbridge Caves," a spot the Ohio Southern Railroad photographed for its own advertising in 1894 and where local social clubs still gathered as late as 1917. The site's tourist history, in other words, predates the lake by at least seventy years.

A road not built next door

In the years after Rocky Fork Lake opened, Brown County boosters — led by the Mount Orab Chamber of Commerce — pushed for a second, larger reservoir on White Oak Creek, the proposed Whiteoak Lake. The Ohio General Assembly funded a study in 1959, and a preliminary engineering survey followed in late 1960, but the Ohio Natural Resources Commission decided against building it in 1961, citing an estimated cost of more than $3 million. The project was shelved years before Paint Creek Lake, the reservoir that eventually was built nearby, was finished in 1974.

A drowning on the ice, and an officer who did not come home

On the evening of February 23, 2021, 16-year-old Keaira Scott of Hillsboro and her 13-year-old brother fell through the ice near the North Shore boat docks. She got her brother to safety before going under herself; he was found by a construction worker, hypothermic but alive. ODNR Natural Resources Officer Jason Lagore, a 15-year agency veteran who had built the department's first K-9 academy, responded to the rescue call and suffered a fatal medical emergency during the search. Divers recovered Scott's body around 11 p.m. that night, roughly four hours after she went under. "After the fact, it turns out that she got him out before she succumbed," a responding lieutenant said. "Don't go out on the ice." Ohio's legislature later named a stretch of State Route 73 through Caesar Creek State Park — not Rocky Fork, where the tragedy happened — the Natural Resources Officer Jason Lagore Memorial Highway; no source found explains why that particular stretch was chosen.

A quieter death, 2020

A year earlier, on May 26, 2020, ODNR investigated a death at Rocky Fork's North Beach. The Highland County sheriff said the circumstances did not suggest criminal activity, and the park stayed open. No name was published in the coverage found.

The lake since

A 1975 federal survey found Rocky Fork eutrophic, ranking it eighth among twenty Ohio lakes sampled for the U.S. EPA's National Eutrophication Survey. Dissolved oxygen was markedly depressed at depth in summer and fall samples, and phosphorus — nearly a third of it from Hillsboro's treatment plant, the rest mostly agricultural runoff — was identified as the limiting nutrient driving algae growth. No modern record of a harmful-algal-bloom advisory specific to Rocky Fork Lake was found, though given the lake's size, its heavy recreational use, and its agricultural watershed, that likely reflects a search gap rather than a clean bill of health.

By 2024 the dam itself was rated in "poor" condition by the National Inventory of Dams — the only dam in this state's lakes with a negative federal condition rating on record — and classified Class I, ODNR's highest risk category. A multi-year rehabilitation project followed: planning began around 2023, and a construction contract let in 2025 covers new access roads, concrete repairs, replacement of the dam's slide gate and electrical systems, and new stairs and structures, with substantial completion scheduled for April 30, 2027. ODNR's Jeremy Wenner, chief engineer of the division handling the work, said the program "ensures the dams are safe and able to support the recreation, wildlife and natural areas that surround them."

The water

Rocky Fork Lake was built for recreation, not water supply, and no source found ties Hillsboro's municipal water system to the lake itself. The lake drains a 114-square-mile watershed at the dam (140 square miles measured further downstream) within the larger Paint Creek sub-basin — the same watershed as Paint Creek Lake, which sits downstream on the same river system.

Unusually for a reservoir this size, Rocky Fork Lake has no continuously monitored pool-elevation record. It isn't a Corps of Engineers project, so it has no modern telemetry feed, and decades of Ohio Water Resources reports that mention "Rocky Fork" all turn out to describe a downstream streamflow gage on Rocky Fork Creek near Barretts Mills, not the lake's own pool level. That downstream gage does have a long record, however, with a pre-dam maximum gage height of 15.56 feet recorded on March 6, 1945 — seven years before the dam existed — and a post-dam flood peak of 3,700 cubic feet per second on May 18, 1995.

Sources

• The Times Gazette, "Lake has potential to be more" (2017)
• The Times Gazette, "What might have been" (Whiteoak Lake)
• Wikipedia, "Rocky Fork State Park (Ohio)")
• Wikipedia, "Rocky Fork Park Site"
• Wikipedia, "Joseph B. Foraker"
• Old Mills Now, "Highland - McCoppin's Mill"
• rockyforklake.com, "About"
• Highland County Press, "Rocky Fork Lake dam renovation set for 2023"
• Highland County Press, "ODNR investigating death at Rocky Fork Lake State Park"
• Fox19, "Teenage girl identified after drowning icy lake"
• WCPO, "ODNR investigating possible drowning at Rocky Fork State Park"
• Local12, "Girl dies after falling through frozen lake in Highland County"
• Dayton Daily News, "ODNR officer dies while responding to rescue at Highland County lake"
• Officer Down Memorial Page, Natural Resources Officer Jason Scott Lagore
• 10TV, "ODNR Officer Jason Lagore honored with highway designation"
• Ohio Guide Collection, "Beaver's Mill and old covered bridge photograph"
• Ohio Guide Collection, "McCoppins Mills photograph"
• EPA National Eutrophication Survey, "Report on Rocky Fork Reservoir, Highland County, Ohio" (1975)

</content>