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Lake Information


Acreage: 53

Recreational Amenities

Boat Fishing? Unlimited HP, No Wake

Boat Ramps? Yes

Boat Rental? No

Skiing? No

Swimming? No

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There are no zebra mussels in this lake.

Lake Status Summary  ( Full PDF Report )

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Fish Status



The 2016 IDNR spring and fall surveys produced the poorest collection of bluegill to date. Very few fish in excess of 6” were collected.



Completely reliant on natural reproduction, the channel catfish population is considered average. IDNR surveys generally fail to yield channel catfish in sufficient numbers. Site Regulation: 6 fish daily limit.



2016 spring trap netting failed to produce any number of crappie, while the fall surveys wasn’t much better. These results were very much contradictory to those observed in the previous survey. Absence of crappie in 2016 may be a sampling anomaly and for this reason the fishery is expected to be “fair” at the very least. Site Regulation: 10 fish daily limit.



Flathead catfish are present in Monster Lake and have been sampled in low number in IDNR surveys. Only two were captured in 2016, the largest weighing over 14 lbs.



Results from the 2016 survey were much improved from the previous effort, and the largemouth bass population appears much better. More than 18% of the sampled adults were legal size, while the average size bass collected measured 9.0”. Several bass exceeding 18” were collected as well, the largest fish eclipsing 6 lbs. Site Regulation: 15” minimum length limit; 3 fish daily limit.



The walleye stocking program was initiated in 2016. Annual stockings will occur for the next several years and based upon the success of those, the program will either continue or be terminated.

Location: Monster Lake is located within the Mazonia State Fish and Wildlife Area South Unit, 2 miles northeast of South Wilmington in Kankakee County off West 5000 Road.

Description: Monster Lake is a large impoundment, covering 52.9 surface acres with depths to 60 feet. Siltation and nutrient loading have resulted due to Granary Creek being routed through the lake; Monster Lake acts somewhat as a flood control reservoir. This connection to the stream, which is a tributary of the Mazon River, has diversified the fishery. Monster Lake is open year ‘round to sport fishing, the only such water area within the Mazonia complex. Anglers are allowed to use boats powered by gasoline engines with an unlimited horsepower restriction. A no-wake regulation is in effect. Some opportunity for shore fishing exists and a primitive gravel ramp serves as boat access.

History and Status of the Sport Fishery: Surveys are conducted on Monster Lake on an alternating year basis. A walleye stocking program was initiated in 2016. No special mercury advisory or other contaminant-related consumption advisories pertain. Additional species found in Monster Lake include freshwater drum, carp, rock bass, longnose gar and various sucker species.

Additional Lake Information: Anglers are allowed to use boats powered by gasoline engines with an unlimited horsepower restriction. A no-wake regulation is in effect. Two pole and line fishing only.

Site Regulations:
Channel catfish: 6 fish daily limit
Largemouth bass: 15” minimum length limit; 3 fish daily limit
White, black, or hybrid crappie: 10 fish daily limit

Contact Information:
Mazonia/Braidwood State Fish & Wildlife Area
IDNR Fisheries Biologist, Rob Miller