06/07/2026
Pinnacle Rock rises 40 feet above Buttermilk Creek in Buttermilk Glen in . Here's how I think it could have formed.
Thousands of years ago, everything you see was stone. The creek was channeled through fractures in the rock (called joints) to the right of where the pinnacle is now. The creek slowly eroded down to where the trail is now.
Meanwhile, however, the water also found a route to the left, and gradually tore its way down there more efficiently, forming its current, preferred passage. Buttermilk Creek consequently abandoned its older route on the right, and it has left Pinnacle Rock standing between them.
Imagine where Buttermilk Creek must have been back then. Just look at the top of Pinnacle Rock. The stream would have been up there!
(It's likely that during high flood times, Buttermilk Creek has gushed around Pinnacle Rock, using both its current and former routes.)
In the 1800s, this formation was known as Steeple Rock.