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Lake Information

County: Williamson

Acreage: 1000

Recreational Amenities

Boat Fishing? 10hp

Boat Ramps? Yes

Boat Rental? Yes

Skiing? No

Swimming? Yes

Picnicking? Yes

Camping? Yes

larger map link Twin Crappie Rocky Comfort Marina Grassy Creek

    Click on area names for a more detailed map.
    Grassy Creek, Marina, Rocky Comfort, Twin Crappie

Maps are not intended for navigation.

Fish Attractors:

There are no zebra mussels in this lake.

Fish Stocking






Channel Catfish

Advanced Fingerling 4 - 7"


Additional information for stocking on Little Grassy Lake

Fishing Outlook  ( Full PDF Report )

Click here for a list of all reports.



Fish Status


Very Good

Little Grassy Lake bluegill abundance in spring 2019, as measured by catch-per-unit-effort, was substantially higher at 93 per hour. The proportion of these fish larger than 6 inches was 59%, bluegill larger than 7 inches made up 21% of the sample. Average bluegill body condition was just below the desirable range.


Very Good

The Little Grassy Lake largemouth bass population is generally well balanced, and contains fish ranging in size from fingerlings to trophies. In 2021, bass abundance was higher-102 were collected per hour of electrofishing (goal is 60/hour). Bass quality, as measured by length, was easily within the management plan goal range with 51% larger than 12 inches and 14% over 15 inches. As is often the case in clear, infertile lakes, bass body condition (measured by relative weight) remained at the lower range of the goal but the 2021 sample included bass over 7 pounds. Site regulation: 12 to 15 inch protective slot limit, 6 per day creel.


Very Good

Little Grassy Lake redear abundance in the spring 2021 sample was nearly over double the previous sample at 73 per hour of electrofishing. Redear quality, based on length continued to be very impressive, with 52% of fish over 7 inches, and 2% larger than 8 inches, with several fish exceeding the 9 inch mark. Redear body condition dipped just below the lower end of the management plan goal range.

Location: Little Grassy Lake is a deep, clear, 1000-acre impoundment located in the south portion of the Crab Orchard National Wildlife Refuge between Marion and Carbondale in Williamson County Illinois.

Description: The Little Grassy Lake fishery is cooperatively managed by the Illinois Department of Natural Resources and U.S. Fish and Wildlife Service. The lake is surrounded by forested land, has three boat ramps, and a marina.

Additional Lake Information: Outboard motor limit is 10hp. A user permit is required to access the Crab Orchard National Wildlife Refuge. Information can be obtained by calling the refuge visitor center at 618-997-3344.

Site Regulations:
Largemouth bass: 12 to 15 inch protective slot limit, 6 per day creel
Channel catfish: 6 per day creel limit

Contact Information:
Crab Orchard National Wildlife Refuge
IDNR Fisheries Biologist, Luke Nelson

There were 10 tournaments held on this waterbody in 2021.

Species Total Fish Caught
Largemouth Bass 406

Top 5 Largemouth Bass caught on this waterbody in 2022 tournaments:

1     7.08 lbs
2     6.54 lbs
3     6.54 lbs
4     6.54 lbs
5     6.52 lbs

Top 5 Total Tournament Weight of Largemouth Bass caught on this waterbody in 2022 tournaments:

1 130.20 lbs
2 119.69 lbs
3 117.25 lbs
4 84.87 lbs
5 66.49 lbs

Multiple day tournaments are listed with * end date.

Interested in participating in one of these public tournaments? Contact us with tournament ID for more information.

2022 – 2023 Approved or Pending Tournaments
Start Date ID Approval Ramp Location Bank/Boat
Max Boats Species Youth? Open to Public?
March-0523394Approvednorthwest ramp boat
20Largemouth Bass
March-1123160Approvednorthwest ramp boat
19Largemouth Bass
March-2523000Approvednorthwest ramp boat
20Largemouth Bass
March-2623644Approvednorthwest ramp boat
10Largemouth Bass