Clinton Township near Sidney in Shelby County, Ohio — The American Midwest (Great Lakes)
Big Rock
Arguably the most iconic natural feature of the park, Big Rock is truly big. Twelve feet high at its tallest point and weighing in at 103 tons, the granite boulder arrived in what would become Tawawa Park about 15,000 years ago. It was transported by a mile-thick sheet of glacial ice from its native land located to the northeast.
According to geologist and Sidney native Albert Binkley Dickas, the Big Rock mineral make-up matches that of a massive, 985-million-year-old outcrop of granite exposed between the cities of Ottawa and Sudbury in southeastern Canada. During earth's most recent ice age, glacial meltwater penetrated fractures in the granite, froze, expanded and broke off rock fragments that were carried 700 miles southwestward into Ohio by the glacial ice. As the climate slowly warmed, the glacier began to melt and retreat to the north, leaving Big Rock as a calling card, testimony to the impressive carrying power of moving ice.
The huge boulder sits along the Ward Trail, at one end of Aschenbach Grove. It has been a favorite place for gatherings of families and friends for decades. Countless children have climbed upon it and historically numerous would-be brides have said "Yes" to suitors poised on one knee. No one knows when it obtained the moniker "Big Rock," but the name was firmly established as early as 1876, more than 70 years before the park was named. A Sidney Journal newspaper account of that year refers to Big Rockas it reports on a group of six stonecutters who carved the outline of the U. S. National Shield on the skyward face of the rock, along with their names and, on the north face that of William Binkley, prominent community leader and editor of The Sidney Journal.
Gift made possible by
Albert Binkley Dickas, Ph.D.
Big Rock historian and maternal great grandson of William Binkley
Reference; Ohio Rocks, Mountain Press, 2015, p. 22-23.
Erected 2021 by Albert Binkley Dickas, Ph.D.
Topics. This historical marker is listed in this topic list: Parks & Recreational Areas. A significant historical year for this entry is 1876.
Location. 40° 17.266′ N, 84° 8.101′ W. Marker is near Sidney, Ohio, in Shelby County. It is in Clinton Township. It is on Tawawa Drive, on the right when traveling east. Touch for map. Marker is at or near this postal address: 50 Whipp Rd, Sidney OH 45365, United States of America. Touch for directions.
Regionally, this marker is in Ohio’s Till Plains. It is also in the American Midwest and in the Corn Belt. Globally, it is in North America, the Western Hemisphere, the Western World, and the Anglosphere. Historically, it finds itself in what was once the Haudenosaunee (Iroquois) Confederacy, the territory of the Mississippian Culture, and the Northwest Territory.
Other nearby markers. At least 8 other markers are within walking distance of this marker: Ross Bridge (approx. 0.2 miles away); Swamp White Oak (Quercus bicolor) (approx. Ό mile away); Zenas King Bowstring Bridge (approx. 0.4 miles away); Tawawawa Park 5k Path Start (approx. 0.4 miles away); Site of the First Football Game played in Sidney (approx. 0.4 miles away); Tawawa Park (approx. 0.4 miles away); Sidney (approx. half a mile away); North Street Bridge, State Route 47 (approx. Ύ mile away). Touch for a list and map of all markers in Sidney.
Credits. This page was last revised on July 30, 2026. It was originally submitted on July 12, 2024, by Craig Doda of Napoleon, Ohio. This page has been viewed 493 times since then and 112 times this year. Photos: 1, 2. submitted on July 12, 2024, by Craig Doda of Napoleon, Ohio. 3, 4. submitted on July 21, 2026, by Craig Doda of Napoleon, Ohio. • Devry Becker Jones was the editor who published this page.



