Waterfall Glen Loop: DuPage County, IL

The gentle cascade of water, a surprising symphony in the heart of DuPage County, greets you as you embark on the Waterfall Glen Loop. This iconic trail, a cherished escape just outside Chicago, immediately immerses you in a landscape where the rhythmic flow of a man-made waterfall whispers against a backdrop of ancient oaks and open prairie. You’ll feel the cool mist on your face, a refreshing prelude to the natural wonders and expansive views that unfold along this beloved circuit, inviting you to leave the urban pace behind and reconnect with Illinois’ unique natural heritage.

Trail Specifications

Route Overview & Natural Highlights

The Waterfall Glen Loop winds through a diverse landscape shaped by glacial retreat and thoughtful land management. You’ll traverse a wide, crushed limestone path that meanders through over 2,500 acres of preserved land, showcasing a unique blend of oak savannas, mature woodlands, and restored prairies. The geology here is primarily glacial till, deposited during the Wisconsin Glaciation, which created the gently rolling topography you’ll experience. This varied terrain supports an impressive array of ecosystems, making each mile a new discovery.

As you progress, you’ll notice the transition from dense stands of White Oak (Quercus alba) and Red Oak (Quercus rubra) to more open savanna environments dotted with Shagbark Hickory (Carya ovata). The restored prairie sections burst with native grasses like Big Bluestem (Andropogon gerardii) and Indian Grass (Sorghastrum nutans), alongside a spectrum of wildflowers such as Purple Coneflower (Echinacea purpurea) and Blazing Star (Liatris spicata). Keep an eye out for local wildlife; White-tailed Deer are common, and you might spot Red-tailed Hawks circling overhead, or hear the distinct calls of Northern Cardinals and Blue Jays. The trail also skirts the perimeter of the Argonne National Laboratory, an internal semantic entity, offering a unique juxtaposition of nature and scientific endeavor. The centerpiece, of course, is the man-made waterfall, a spillway from a former quarry, which empties into a tributary of the Des Plaines River, another vital semantic entity in the region’s natural network.

Turn-by-Turn Trail Breakdown

Trailhead Start (Lemont Road)
Beginning from the main parking lot off Lemont Road, you’ll step onto the wide, well-maintained limestone path. The initial stretch leads you through a mix of woodlands and open areas, gently ascending and descending. Within the first mile, you’ll encounter the famous waterfall, a picturesque spot where water cascades over rocky ledges. This is a popular photo opportunity and a peaceful place to pause before continuing your journey.

Mid-Trail Features & River Views
Past the waterfall, the trail continues its expansive loop. You’ll navigate several smaller bridges that cross over tributaries feeding into the Des Plaines River, offering glimpses of the river itself. The path here is generally flat, making for easy walking or cycling. You’ll pass through diverse habitats, from shaded groves where sunlight filters through dense canopies to sun-drenched prairies alive with buzzing insects and swaying grasses. The northern section of the loop offers more open views and the occasional sight of the Argonne National Laboratory’s facilities in the distance, subtly reminding you of the area’s dual identity as both natural preserve and research hub.

Completing the Loop & Return
As you round the northern and western sections, the trail gradually curves back towards your starting point. The scenery remains captivating, with different perspectives of the woodlands and savannas you encountered earlier. You’ll likely notice how the light changes the character of the landscape throughout your hike. The final miles bring you back through familiar territory, completing the full 9.5-mile circuit and depositing you back at the Lemont Road trailhead, refreshed and invigorated by the expansive natural beauty of Waterfall Glen.

Seasonal Guide & Best Times

• Spring (April – May): Expect fresh greenery, blooming wildflowers like trillium and bloodroot, and active birdlife. Temperatures are mild, making it ideal for longer hikes before summer heat arrives.
• Summer (June – August): Prairies are at their peak with tall grasses and vibrant wildflowers such as coneflower and blazing star. Be prepared for warmer temperatures and humidity; early mornings or late afternoons are best.
• Autumn (September – November): A spectacular display of fall foliage, particularly from the oak and hickory trees, transforms the landscape into a canvas of reds, oranges, and yellows. Cooler, crisp air makes for incredibly comfortable hiking.
• Winter (December – March): A serene, quiet beauty blankets the preserve. The trail is often open for cross-country skiing and snowshoeing after fresh snowfall. Dress in layers, and enjoy the stark, peaceful beauty of the frozen landscape.

Essential Gear & Safety

• Hydration: Carry ample water, especially during warmer months. There are no water sources on the trail.
• Appropriate Footwear: Sturdy walking shoes or hiking boots are recommended for the crushed limestone path.
• Sun Protection: Hat, sunglasses, and sunscreen are advised, as sections of the trail are exposed.
• Navigation: While the loop is well-marked, a map or a GPS app on your phone can be useful for peace of mind. Check out the Waterfall Glen Loop on AllTrails.
• Insect Repellent: Particularly important during spring and summer to ward off mosquitoes and ticks.
• Leash for Dogs: If bringing your canine companion, ensure they remain on a leash at all times for their safety and the preservation of wildlife.

Getting There & Parking

Waterfall Glen Forest Preserve is easily accessible from various points in DuPage County. The main and most popular trailhead is located off Lemont Road, just south of I-55 in Darien/Lemont, Illinois. Ample free parking is available at this lot. Additional parking areas can be found off Cass Avenue and Bluff Road, offering alternative starting points for the loop. All parking lots are typically open from one hour after sunrise to one hour after sunset, consistent with Forest Preserve District of DuPage County regulations. There are no parking fees for Waterfall Glen.