Loud Thunder Forest Preserve

19406 Loud Thunder Road, Illinois City, Illinois 61259
(309) 795-1040

Hours of Operation: Sunrise to 10:00PM

Park Office Hours
Mon: 8AM to 4:30PM
Tues: 8AM to 4:30PM
Wed: 8AM to 7PM
Thurs: 8AM to 7PM
Fri: 8AM to 7PM
Sat: 11AM to 7PM
Sun: 11AM to 7PM
May - August:
Mon: 8AM to 7PM
Tues: 8AM to 7PM
Wed: 8AM to 7PM
Thurs: 8AM to 7PM 
Fri: 8AM to 8PM
Sat: 8AM to 8PM
Sun: 8AM to 7PM
Labor Day (Sept) - October:
Mon: 8AM to 4:30PM
Tues: 8AM to 4:30PM
Wed: 8AM to 7PM
Thurs: 8AM to 7PM
Fri: 8AM to 7PM
Sat: 11AM to 7PM
Sun: 11AM to 7PM
November - March:
Mon: 8AM to 4:30PM
Tues: 8AM to 4:30PM
Wed: 8AM to 4:30PM
Thurs: 8AM to 4:30PM
Fri: 8AM to 4:30PM
Sat: Closed
Sun: Closed

Boat Rental Hours (June 1, 2020 to September 7, 2020):   

Mon & Tues: Closed
Wed-Sun: 8:00AM to 7:00PM 

Camping and more: 


The camping season is generally April 1 through October 31 each year as weather permits.  Advanced notices of closures will be posted as soon as practicable. Camping is open with restrictions due to the Govenor's Executive Order.

Loud Thunder is the largest of the Rock Island County forest preserves at 1,480 acres. One of the main attractions at Loud Thunder is Lake George, a 167-acres man-made lake with depths up to 55 feet and stocked with many varieties of fish. Other amenities are:

Loud Thunder Forest Preserve History

Loud Thunder began in 1944 with the purchase of 1,240-acre ranch from Charles Searle. Adjacent properties were later purchased creating the existing park totaling 1,480 acres.

The development of the preserve started in the 1950's with the creation of campgrounds, trails, and parking lots. In 1967, the Big Branch Creek that ran through the preserve was dammed to create Lake George.