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Lake Information

County: Grundy

Acreage: 33

Recreational Amenities

Boat Fishing? Yes

Boat Ramps? Yes

Boat Rental? No

Skiing? No

Swimming? No

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There are no zebra mussels in this lake.

Fish Stocking






Channel Catfish

Advanced Fingerling 4 - 7"


Additional information for stocking on MAZONIA #7 - BULLHEAD LAKE

Fishing Outlook  ( Full PDF Report )

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Fish Status



Bluegills numbers decreased in the 2019 survey primarily due to sampling effort as opposed to any decline in the population. The proportion of quality size bluegills (6”+) increased greatly from the 2017 survey but no bluegills larger than 8” were collected. The average size bluegill collected in the 2019 survey measured 5.2” which is slightly below the long-term average.



A difficult species to sample in strip-mine lakes, channel catfish were collected in poor low number in 2019 due to the absence of gill netting from this survey. Reproduction and recruitment appear sporadic. Channel catfish are stocked on a rotational basis with other Mazonia lake.



White and black crappie were collected in low number in 2019 with black crappie the more numerous of the two species. However this is based solely upon electrofishing which generally is not the best sampling methodology for crappie assessments. The majority of the crappie collected exceeded 8” but none eclipsed 11”.



Electrofishing catch rates continued to increase in 2019 but survey results tend to indicate a population which has trended towards smaller, younger bass. This is reflected in decreases in both in several population structural indices; quality size and larger bass (8”+) decreased and did the density of legal size bass. The high density of these smaller bass has had the effect of increasing competition and causing suppressed body condition. This could result in slowed growth and impact the production of larger fish. This situation appears to be somewhat cyclical with bass populations in this lake. The average size bass collected in 2019 measured 10.8”, which is well below the long-term average.

Location: Bullhead Lake (Lake #7) is located within the Mazonia State Fish and Wildlife Area Main Unit, 3 miles southwest of Braidwood in Grundy County on Illinois Route 53 and Huston Road.

Description: Bullhead Lake is one of the largest impoundments in the Main Unit at 32.9 surface acres. Shoreline access is limited by extensive stands of tall reed grass. The lake has a one-lane concrete boat ramp with adjacent parking. Bullhead Lake is closed to fishing during upland game and waterfowl season. Following the completion of the hunting seasons, it reopens for ice fishing dependent upon ice conditions.

History and Status of the Sport Fishery: No special mercury advisory or other contaminant-related consumption advisories pertain. Bullhead Lake is surveyed on an alternate year basis. Fish stocking has been limited to mainly channel catfish. A variety of other species that can be caught in Bullhead Lake include common carp, freshwater drum, bullheads, green sunfish and several gar species.

Additional Lake Information: Trolling motor only. Two pole and line fishing only.

Site Regulation:
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, Seth Love