Great Falls of the Illinois River
By Armen Suny · Last verified May 2026
Photo Credits (4)
Difficulty
Moderate
Trail Length
2.4 miles
Trail Type
Out And Back
Elevation Gain
350 ft
About Great Falls of the Illinois River
The Great Falls of the Illinois River is a scenic waterfall located in Illinois, known for its dramatic flow during periods of high water, particularly in spring. The falls are part of the Illinois River and are surrounded by natural beauty, making it a popular spot for nature enthusiasts.
The Setting
Great Falls of the Illinois River sits at 463 feet along the Illinois River, in the coastal lowlands of Illinois.
Trail & Hike Details
The Approach
The moderate 2.4-mile out-and-back trail gains 350 feet of elevation on the way to the falls.
Trail Description
Trail information for accessing the Great Falls of the Illinois River is not well-documented. Visitors should prepare for varying conditions and check with local resources for the most accurate details.
What to Expect
Expect a scenic view of the Illinois River and the falls, particularly during periods of high water flow. The surrounding area may offer opportunities for hiking, photography, and wildlife observation.
Accessibility
The trail is not wheelchair accessible. Uneven terrain and elevation changes require steady footing.
Frequently Asked Questions
🐶 Are Dogs Allowed at Great Falls of the Illinois River?
❌ Dogs are not allowed
Are There Any Fees or Permits Required?
🆖 No fees required
🏊 Is There Swimming at Great Falls of the Illinois River?
❌ Swimming is not allowed
When to Visit
Spring is typically the best time to visit, as the falls are most active during periods of high water flow.
Seasonal Access
The best time to visit is Spring, Summer, and Fall. Winter access may be limited.
Safety Information
Exercise caution near the river, especially during high water flow. Slippery rocks and strong currents may pose hazards.
Current Water Conditions
21,700 ft³/s
Current discharge — how much water is flowing
Much higher than usual for this time of year
Based on 106 years of record
15.14 ft
Water depth at gauge
7-Day Discharge Trend
What does this mean for your visit?
The water is flowing much higher than usual, expect an impressive display.
About This Gauge
7-Day Flow Outlook
Based on the USGS gauge ILLINOIS RIVER AT MARSEILLES, IL (1 km away).
Today
Moderate
21700 cfs
9/10Tomorrow
Moderate
22157 cfs
9/10Thu
Moderate
23697 cfs
6/10Fri
Strong
25315 cfs
7/10Sat
Strong
25152 cfs
7/10Sun
Moderate
22932 cfs
9/10Mon
Moderate
21217 cfs
9/10Best window: Today — moderate flow, sunny (trip score 9/10).
Best time of year: this gauge typically runs highest from early March to mid May, peaking in March.
How we calculate this
This is a transparent outlook, not a precise forecast. We take the waterfall's current flow strength (how it ranks against its historical normal for today, from the nearest USGS stream gauge), carry that ranking forward along the gauge's seasonal curve, and nudge it for forecast rain. Confidence is highest for the next day or two and falls further out. Always check official conditions and your own judgment before visiting — high flows can be dangerous.
Know when to go.
Get a free email alert when waterfalls near Marseilles hit peak flow. We only send when conditions are worth the trip — no weekly newsletters, no spam.
Weather Forecast
Location & Access
Getting There
The Great Falls of the Illinois River can be accessed via nearby roads leading to the Illinois River area. Specific directions may vary depending on the exact location of the falls.
Get Directions on Google MapsParking
Parking availability is not well-documented, but visitors may find parking areas near the river or nearby parks.
Elevation
463 feet above sea level
Coordinates
41.327811° N, -88.725074° W
Visitor Tips & Gear
Visit during spring or after heavy rains for the most dramatic waterfall flow. Wear sturdy shoes and be prepared for uneven terrain if hiking is required.
As an Amazon Associate, we earn from qualifying purchases.
With 2.4 miles and 350 ft of elevation gain, sturdy boots and trekking poles will help on this moderate trail. Sun exposure on the trail makes good sun protection a must in summer.
Polarized Sunglasses (Knockaround)
Cuts glare off the water so you actually see the falls — and your photos turn out better too.
Columbia Watertight II Rain Jacket
Packs into its own pocket, seam-sealed, and keeps you dry from spray and surprise rain.
Earth Pak Waterproof Dry Bag
Keeps your phone and gear dry when waterfall mist soaks everything else.
Waterproof Phone Pouch (AiRunTech)
Cheap insurance — take photos right next to the falls without killing your phone.
Timberland Euro Sprint Mid Waterproof
Trusted waterproof boot with premium leather and grippy rubber sole — reliable on rocky, wet trails.
TrailBuddy Trekking Poles
Lightweight aluminum, cork grips, and flip-locks that actually hold — a best-seller for good reason.
Where to Stay
Postcard Cabins Starved Rock, Outdoor Collection by Marriott Bonvoy
Holiday Inn Express & Suites - Ottawa by IHG
Quality Inn Ottawa near Starved Rock State Park
Fairfield Inn & Suites by Marriott Ottawa Starved Rock Area
Browse vacation cabins and private rentals nearby
Unique outdoor stays — tents, yurts, and treehouses
Rent a campervan or RV for your waterfall road trip
Some links are affiliate links. We may earn a commission at no extra cost to you.
Additional Information
Nearby Attractions
Nearby parks and natural areas along the Illinois River may offer additional recreational opportunities.
Wildlife
The area around the Illinois River is home to a variety of wildlife, including birds, fish, and small mammals.
Cities near Great Falls of the Illinois River
Writing about Great Falls of the Illinois River? Embed this waterfall on your site for free.