Mermet State Lake

Info / Massac County

Location 452 acres

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

Fishing Outlook

Recent Stocking History
2025 Channel Catfish Advanced Fingerling (4 - 7") 10017
2024 Channel Catfish Advanced Fingerling (4 - 7") 4000
2024 Channel Catfish NonVulnerable (8 - 10") 6115
2024 Largemouth Bass Fingerling (1 - 3") 10000
2023 Channel Catfish Advanced Fingerling (4 - 7") 10000

Contact

Nelson, Luke
IDNR Fisheries Biologist
Send Message
618-985-1112
Mermet Site Office
618-524-5577

Description

Mermet Lake 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 more than 50 years. Curlyleaf pondweed, a non-native aquatic plant, invaded Mermet Lake in 1999, and has caused occasional summer fish kills since then. 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.

Site Regulations

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 7 days prior to the opening of the South Zone Duck Season and reopens after the season ends.

Site-Specific Fishing Regulations:

  • Recreational Use Restriction: Waterfowl Refuge or Hunting Area (see above)
  • All Fish: 2 pole and line fishing only and each pole must not have more than 2 hooks or lures attached while fishing; bow fishing is allowed
  • Channel Catfish: 6 Fish Daily Harvest Limit
  • Large or Smallmouth Bass: 16 inch Minimum Length Limit; 3 Fish Daily Harvest Limit
  • White, Black or Hybrid Crappie: 25 Fish Daily Harvest Limit

Additional Information

Planning to eat your catch?  Fish Consumption Advisory information can be found here: Fish Consumption Advisory Page

Fish Attractor Map

Fish Attractor: Mermet Lake Fish Attractor:  Mermet Lake