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Hidden History of Glacial Ridge

Churchill Woods Forest Preserve in Glen Ellyn is one of the DuPage Forest Preserve District’s most popular forest preserves.

But there’s a small section of Churchill Woods that’s tucked in a far corner, apart from the rest of the preserve and not as well known. This little piece of land, known as Glacial Ridge, has experienced some massive changes throughout its history.

Glacial Ridge lies south of the main section of Churchill Woods Forest Preserve. It is located west of Hill Avenue and Longfellow Avenue., just north and east of Walnut Glen Park. It lies between the Union Pacific West Railroad and the Illinois Prairie Path. When walking on the Prairie Path, Glacial Ridge rises to 40 feet above the path on both sides.


The top of the kame at Glacial Ridge at Churchill Woods Forest Preserve in Glen Ellyn.


A Glacial History

Between 10,500 and 30,000 years ago, the last of four major glaciers passed over DuPage County. Known as the Wisconsin Glacier, this massive ice flow and its movement formed the hills and valleys we still see today in northeastern Illinois.

Nearly one mile thick, the Wisconsin Glacier slowly advanced from large snow events, pushing the earth like a bulldozer, scraping and churning up rocks ahead of it. The large boulders left behind are called glacial erratics.


Some of the glacial erratics left behind from the Wisconsin Glacier at Glacial Ridge at Churchill Woods Forest Preserve.


As the climate warmed the ice melted and receded. This process happened several times, leaving behind long hills called end or terminal moraines. Three distinct end moraines and several smaller end moraines run through DuPage County, and each one follows the larger streams that run through the county. Salt Creek (Tinley Moraine), East Branch DuPage River (Valparaiso Moraine), and West Branch DuPage River (West Chicago Moraine) follow the valleys created by the Wisconsin Glacier.


An illustration showing where the various moraines ended. Illustration by Wayne Lampa


Glacial Ridge is a glacial kame that formed west of the Valparaiso Moraine. Kames are glacial hills that consist of material like rocks, gravel, and sand. They’re formed when a stream of meltwater deposits material into cracks or holes in the ice of the melting glacier.


An illustration showing how a kame is formed. Illustration courtesy of 


As the glacier melts away, the material accumulates, creating a hill-like structure in the middle of the flat zone (outwash plain) left by the glacier. The Glacial Ridge kame stretches about a third of a mile, where it gently slopes back to the flat surface of the outwash plain.


A Railroad Runs Through It

In September 1900, the Aurora, Elgin, & Chicago Railway began building a new electric railway to connect Aurora and Elgin to Chicago’s Loop. The goal was to run high-speed electric trains on their own line to avoid delays with freight traffic. Building the two railroad tracks involved excavating into the Glacial Ridge kame soils.


A Chicago, Aurora & Elgin railcar. Photo courtesy of the Illinois Railway Museum


For years the railroad transported 100,000 passengers daily through two world wars, the Great Depression, financial trouble and several management changes. On July 3, 1957, the railway service ended and all train operations ceased. Ten years later, the DuPage County Highway Commission purchased the abandoned track bed and created the Illinois Prairie Path.


The route map of the Chicago, Aurora & Elgin Railroad. Map courtesy of Wikimedia Commons


Glacial Ridge as a Forest Preserve

Thanks to the foresight of local DuPage County conservation groups, the eight-acre Glacial Ridge property was acquired by the DuPage Forest Preserve District on Dec. 16, 2004. Even though the area was dug out and excavated for a railroad and used as a gravel pit, the site is still host to more than 100 native plant species, including some state-endangered plants. Due to the unique glacial kame soil and steep slopes, the site is sensitive to disturbance and erosion.


A 1914 photo of the gravel pit at Glacial Ridge at Churchill Woods Forest Preserve in Glen Ellyn.


To visit Glacial Ridge, you need to walk or bike to it, as there are no nearby parking lots. On your way to the preserve, look for large boulders along the Prairie Path. These glacial erratics were left by the melting Wisconsin Glacier. Also, look for old concrete bases from the signal towers that provided power and direction for the trains rolling through.

Abandoned- cable-1000x600

Look closely while exploring Glacial Ridge and you might find cable from the Chicago, Aurora & Elgin Railroad, which used to operate in the area.


The trails in Glacial Ridge are footpaths, so park your bike and lock it up before you enter. Feel free to carefully navigate the paths up and down the slopes of the preserve on foot. As you walk, keep an eye out for the historical remnants of the Aurora, Elgin & Chicago Railway. Old creosote-soaked electric pole stumps can be found with native vegetation growing out of them. There’s even an abandoned cable that held the lines that powered the trolleys as they ran past this amazing glacial landform. Enjoy the view as you make your way up through the oak woodland to the top of the kame.


Other evidence of the Chicago, Aurora & Elgin Railroad that you might run across at Glacial Ridge include electrical poles like this.


Bruce Blake, the volunteer steward at Glacial Ridge, shared his favorite thing about Glacial Ridge: “I love the feeling of how remote and quiet it can be when the landscape turns green. Sitting down on a log and looking over the rolling landscape and not realizing you are a stone’s throw from civilization. So this is how it looked 200 years ago.”


Bruce Blake, volunteer steward at Glacial Ridge at Churchill Woods Forest Preserve in Glen Ellyn.



About Hidden History blogs

From glaciers to mounds, mammoths and farms, each month we highlight the often-overlooked history of our preserves and provide context to deepen your connection to the land, as well as tell the stories revealed to us through the objects and formations left behind. Stay tuned as our blog contributors bring you closer to your community through story every month.

Dave Andrusyk

Photo of blog author Dave Andrusyk
Dave Andrusyk is the Fullersburg Woods campus coordinator at the Forest Preserve District and has worked for the District since 1998. He spent five years working in Natural Resource Management, doing restoration work in the preserves. Dave later taught school, scout and general public programs in the District’s forest preserves. His knowledge of native gardening stems from years of field experience with the Forest Preserve District and working on native plots at his home.

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