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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

There are no zebra mussels in this lake.

Maps are not intended for navigation.

Lake Status Summary  ( Full PDF Report )

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Fish Status



Collected in good numbers, bigger bluegills have been a rare commodity in IDNR surveys. That held true in 2014 as bluegills collected averaged 4.4” with very few collected larger than 7”.



Completely reliant on natural reproduction, the channel catfish population is average. When gill netting is utilized, channel catfish have only been collected in low number. The 2014 survey yielded fish ranging from 18” to 21”.



Monster Lake has a good crappie fishery with white crappie most common. Crappie collected in 2014 ranged in size up to 13.4” and over one pound while averaging 9.4”.



Flathead catfish are present in Monster Lake and can be caught near the Granary Creek cut-off.



Numbers have been declining in IDNR surveys for the last several years. However, young bass were more prevalent in the 2014 survey and if this proves to be a strong year class, could help improve the population and bass angling success in the future. Less than 10% of the sampled adults were legal size, while the average size bass collected measured 7.7”, which is slightly larger than the long-term average.



A walleye stocking program is scheduled to begin in Spring 2015.

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 has been proposed and approved and is scheduled to begin in Spring 2015. 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.

Contact Information:
Mazonia/Braidwood State Fish & Wildlife Area
IDNR County Fisheries Biologist