Rocky Fork State Park is an area steeped in the rich Indian history of Ohio. The land provided abundant game and a ready transportation system in the nearby creeks and rivers. These same streams provided access to the Rocky Fork area for the first settlers.

Plentiful water attracted a number of millwrights to the Highland County region. During the 1800s and the early 1900s, at least six different mill sites were established along Rocky Fork's banks. These mills not only ground flour, but also cut lumber, carded wool and even wove blankets. Water-powered industry was instrumental in the early development of the locale.

The only mill remaining on the Rocky Fork is the J. A. McCoppin Mill found just below the Rocky Fork spillway and operated until the 1970s. First built by David Reece in 1810, the earliest mill was washed out during high water. Soon after the destructive flood, the present cut-stone dam was built. These mills were the focal point of early rural life.

In 1897, surveyors for a proposed railroad came to the countryside that would one day be the park. Local people had high hopes that the new "Black Diamond" rail line would bring prosperity to the area. The addition of rail transportation would enable the local mills to ship flour and other mill industry goods all over the country. There was to be a depot built in Rainsboro with a stockyard and telegraph office. Meetings were held by railroad officials to secure a right-of-way from nearby landowners. A town was planned near McCoppin's (at that time Costello's) Mill. Unfortunately, the "Black Diamond" never got past the planning stages, and the new town of Lodore never came to be.

The eastern part of Highland County has been a resort location for many years. The "Seven Caves" and nearby Rocky Fork gorge attracted visitors even in the mid 1800s. At the turn of the century, Colonel Walter H. Hutchins, a regular visitor to the area from Cincinnati, first dreamed of building a dam near McCoppin's Mill. He was the lake's biggest promoter and saw construction begin in 1949. The first water spilled over the dam in April 1953. Since that summer, thousands of people have visited Rocky Fork State Park. The lake has become a favorite of fishermen and water sports enthusiasts.

Ohio does not have an annual pass and does not charge entrance fees to state parks.

There are 190 campsites suitable for trailers and tents at the northwest corner of the lake. The campground is equipped with showers, flush toilets, laundry facilities, dump station, camp store and campers' beach. Electric hookups are available at 130 sites, with an additional 20 sites offering full-service hookups. Pet camping is permitted on designated sites in both the electric and non-electric areas. A launch ramp and tie-ups are provided for campers with boats.

A separate group camp may be reserved by contacting the park office. The recreation barn also may be rented. It contains meeting space, restrooms, showers and a modified kitchen.

Three marinas are located around the lake. One marina provides fuel; all three have launch ramps, docking space and parking. The East Shore Marina includes a modern restaurant while a snack bar is provided at North Beach.