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GRUNWALD LAKE


Lake Information

County: Kane

Acreage: 15

Average Depth: 8.00 feet

Recreational Amenities

Boat Fishing? Electric motors

Boat Ramps? Yes

Boat Rental? No

Skiing? No

Swimming? No


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There are no zebra mussels in this lake.


Fishing Outlook  ( Full PDF Report )

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Species

Rank

Fish Status

BLACK CRAPPIE

Fair

Deeper water in this lake make crappie difficult to detect with electrofishing. Black Crappies tend to be very cyclical in their population numbers. We typically don’t manage for or stock Crappies in small ponds as they can become over-abundant and compete with young of year Largemouth Bass. The IDNR strongly discourages illegal stocking of Crappie for this reason.

BLUEGILL

Very Good

The Bluegill catch rate of 165 fish per hour is higher than the management goal, but not high enough to cause concern. Bluegill abundance was lower in 2014 and 2018 when catch rates were 82 and 70 fish per hour. Size structure looked better in the 2014 and 2018 samples with over 60% of the stock measuring longer than 6 inches. Size structure has decreased in quality in our 2023 sample. Bluegill ranged in length from 1.3 to 6.9 inches, with an average length of 3.9 inches. Of all the Bluegill in the sample of stock length or greater (4 inches), 6% were greater than 6 inches. The Bluegill are healthy and most likely ready to spawn (some were seen on beds). We may have sampled this lake a little too early this time around, missing the largest Bluegills when they are in the shallows spawning. We don’t have creel data to know what harvest is like, but a 10 fish limit should prevent over-harvest of Bluegill.

CHANNEL CATFISH

Improving

Fishing for channel catfish should be better in the future as this lake will be entered into IDNR’s channel catfish stocking program. Anglers should not be surprised if they hook into one.

LARGEMOUTH BASS

Good

Largemouth Bass were captured at a rate of 183 fish per hour. We typically like to see Largemouth Bass abundance around 60 fish per hour. When abundance get as high as triple the management goal, we start to worry about the population getting stunted. We caught 122 Largemouth Bass ranging in size from 3.7” to 19.9” with the largest fish weighing 4.25 pounds. The average length Largemouth Bass was 10.1 inches. 23% of the stock (bass over 8 inches) was longer than the “quality” size of 12 inches. We sampled Largemouth Bass over 15 and 18 inches and 6% of the stock were longer than 15 inches and 3% were longer than 18. These numbers are higher than the two previous surveys, when no fish over 15 inches were sampled. The best estimate of recruitment is the fact that this lake has not been stocked with Largemouth Bass in the last ten years and there are several year classes of Bass – indicating natural reproduction is sustaining the population. Based on this sample, the bass population is over-abundant. Size structure was better than in previous surveys but could be skewed by the timing of the sample as well as the morphology of this deep clear lake. This Bass population could use some harvest of smaller individuals (less than 14 inches), in accordance with the current regulation (three Largemouth Bass under 14 inches).

Location: Lake Grunwald is located at the Grunwald Farms Forest Preserve south of Elburn. This off-the-beaten-path lake can be accessed by heading west on Main Street from Route 47 (near Fisherman’s Inn). The entrance is off of Lorang Road approximately 1.1 miles west of Route 47 (02S035 North Lorang Road, Elburn).

Description: Lake Grunwald is a 15-acre former gravel mine with a maximum depth of 20 feet and an average depth of 8 feet. The lake is owned by the Forest Preserve District of Kane County (FPDKC) and opened in 2012. There is good shoreline fishing access available via a gravel trail around the lake. Electric motors are allowed and a boat ramp is available. Complex structure of drop offs and flats provide diverse habitat in this lake. Several fish attracting structures are located in the lake.

History and Status of the Sport Fishery: In 2014, the FPDKC entered into a cooperative management agreement with the Illinois Department of Natural Resources to facilitate fisheries management activities. Channel catfish are occasionally stocked to supplement the population. Site-specific regulations apply. An electrofishing survey took place in May 2023.

178 fish belonging to two species were captured. Largemouth Bass were the most abundant species in the sample making up 69% (N=122) of the fish captured. Bluegill were abundant and 56 were collected for a twenty-minute sub-sample of the survey. Black Crappie, Koi (Illegal pet dumping) and Hybrid Sunfish were captured in previous surveys. Northern Pike and Smallmouth Bass have been also stocked in Grunwald Lake.

Additional Lake Information: Two pole and line fishing only.

Site Regulations:
Largemouth Bass: 14-18-inch protected slot limit; 4 fish daily creel limit with 3 fish that can be harvested under 14 inches and 1 fish 18 inches and larger
Bluegill: No minimum length limit; 10 fish daily limit
Channel Catfish: 3 fish daily limit
White and Black Crappie: 10 fish daily limit
Northern Pike: 24-inch minimum length limit; 1 fish daily limit

Contact Information:
Forest Preserve District of Kane County
630-232-5980
IDNR Fisheries Biologist, Andy Plauck
815-675-2386 ext. 214