Great Falls of the Illinois River
By Armen Suny · Last verified Sep 2026
LiDAR & 3D terrain
Photo Credits (4)
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
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
Accessibility information is not well-documented. Visitors with mobility concerns should check with local resources for details.
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
4,610 ft³/s
Current discharge — how much water is flowing
About average for this time of year
Based on 107 years of record
11.40 ft
Water depth at gauge
7-Day Discharge Trend
What does this mean for your visit?
Flow is about average for this time of year.
About This Gauge
7-Day Flow Outlook
Based on the USGS gauge ILLINOIS RIVER AT MARSEILLES, IL (1 km away).
Today
Low
4610 cfs
6/10Tomorrow
Low
5001 cfs
6/10Mon
Low
5131 cfs
6/10Tue
Low
5044 cfs
6/10Wed
Low
5035 cfs
6/10Thu
Low
5062 cfs
6/10Fri
Low
4940 cfs
6/10Best window: Today — low flow, patchy frost then sunny (trip score 6/10).
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
The Terrain, Seen by LiDAR
Aircraft-mounted lasers measured this ground to within inches. Trees and buildings are digitally stripped away, leaving the bare shape of the land the water has carved.
Drag to compare. The dot marks the waterfall. The frame is about a mile across.
Elevation data: USGS 3D Elevation Program. Aerial imagery: USGS The National Map. Public domain.
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.
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
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