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Lake Information

County: Massac

Acreage: 450

Average Depth: 200.13 feet

Shoreline Length: 3.5 miles

Recreational Amenities

Boat Fishing? Unrestricted

Boat Ramps? Yes

Boat Rental? Yes

Skiing? No

Swimming? No

Picnicking? Yes

Camping? No

Maps are not intended for navigation.

There are no zebra mussels in this lake.

Fish Stocking






Channel Catfish

Advanced Fingerling 4 - 7"



Channel Catfish

Non-vulnerable 8 - 10"



Channel Catfish

Advanced Fingerling 4 - 7"



Largemouth Bass

Fingerling 1 - 3"


Additional information for stocking on MERMET STATE LAKE

Fishing Outlook  ( Full PDF Report )

Click here for a list of all reports.



Fish Status


Very Good

Bluegill weresubstantially less abundant in 2020 than in the previous year at 29 per hour of electrofishing, 23% were larger than 6 inches (within desirable management goals), with 14 percent of the sampled population exceeding 7 inches. Bluegill body condition was still excellent.



Channel catfish are generally not a large component of the annual Mermet Lake electrofishing sample, and 2020 followed this trend. No fish were sampled. Annual channel catfish stockings help support a fishery which is very popular with the angling public. Site regulation: 6 per day creel.


Very Good

Small numbers of white and black crappie were sampled in 2020. However, as a note, crappie weighing more than 2 pounds have been fairly regularly reported by Mermet Lake anglers, and sampling techniques will be implemented in the future to more adequately sample them. Site regulation: 25 per day creel.


Very Good

Largemouth bass were collected at a rate of 33 per hour in fall 2020, down substantially from last year. 94% of these fish were larger than 12 inches, which easily met the management plan goal. Bass larger than the old 14 inch minimum size limit made up 72% of the sample, while 22% exceeded the newly implemented length limit of 16 inches. Bass condition remained excellent. Site regulation: 16” minimum length limit, 3 per day creel.



No Redear sunfish were present in the fall 2020 sample. It is assumed that these fish are not scarce, but their location at the time of sampling does not overlap with sample locations. Future surveys will be implemented to better survey Bluegill and Redear populations.

Location: Mermet Lake is a shallow, 452-acre, IDNR-owned impoundment located in Massac County approximately 10 miles north of Metropolis.

Description: Mermet was originally built as a water supply for flooding adjacent wetland compartments for waterfowl hunting, but sport fish flourished when stocked, and the lake has been managed for fishing for approximately 50 years. Curlyleaf pondweed, an exotic aquatic plant, invaded Mermet in 1999, and has caused occasional summer fish kills since then, but annual herbicide treatments have generally been successful at controlling the impacts of this plant in recent years, allowing the sport fish population to slowly recover.

Additional Lake Information: The outboard motor limit is 10 hp, but boats with larger outboards are allowed to operate at no-wake speed. Mermet Lake is closed to fishing during the duck season.

Site Regulations:
Largemouth bass: 16” minimum length limit, 3 per day creel
Black and white crappie: 25 per day creel
Channel catfish: 6 per day creel

Contact Information:
Mermet Site Office
IDNR Fisheries Biologist, Luke Nelson

There were 1 tournaments held on this waterbody in 2020.

Species Total Fish Caught
Largemouth Bass 39

Top 5 Largemouth Bass caught on this waterbody in 2020 tournaments:

1     4.60 lbs

Top 5 Total Tournament Weight of Largemouth Bass caught on this waterbody in 2020 tournaments:

1 114.79 lbs
2 0.00 lbs