Chimney Rock and the Spine of the Trail

Two hundred miles west of here, a spire of volcanic ash and clay rises three hundred feet above the North Platte River valley, visible from the road for hours before you reach it. To the westbound traveler crossing the high plains, it has always looked like a landmark, and it was. Chimney Rock was among the most-mentioned geographic features in the journals and diaries of Oregon Trail emigrants during the great migration years of the eighteen forties and eighteen fifties. Not the Rocky Mountains. Not the Continental Divide. Chimney Rock.

The column was already eroding when the emigrants saw it. Earlier accounts from the eighteen twenties described it as taller than it appeared by mid-century. Wind and rain and the relentless softness of the Brule clay that composes its upper section have been working at it for millennia, and they continue. The rock is smaller today than it was in eighteen forty-eight.

What it represented to travelers was progress. After weeks of walking the flat tablelands of what is now eastern Nebraska, the sight of Chimney Rock meant that the terrain was about to change. The bluffs and breaks along the North Platte were the early signal that the Great Plains were ending and the geological west was beginning. The Wildcat Hills just to the south, composed of the same ancient lake sediments and ash falls, mark the edge of a formation that would eventually lead travelers to Scott's Bluff and then to the Wyoming basin.

People wrote about Chimney Rock the way travelers write about landmarks they have been told to watch for. They described its shape in careful detail: like a haystack with a pole, like a factory chimney, like a lighthouse without a light. Every description is slightly different. What they agreed on was this: they had seen it, and they were still going, and the land ahead was something new.