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FORBES LAKE


Lake Information

County: Marion

Acreage: 585

Average Depth: 15.16 feet

Shoreline Length: 22.2 miles

Recreational Amenities

Boat Fishing? Unrestricted

Boat Ramps? Yes

Boat Rental? Yes

Skiing? Yes

Swimming? Yes

Picnicking? Yes

Camping? Yes

  Trout stocked in fall

  Trout stocked in spring

larger map link Mountain Phillips Dam


    Click on area names for a more detailed map.
    Dam, Mountain, Phillips

Maps are not intended for navigation.


There are no zebra mussels in this lake.


Fish Stocking

Year

Species

Size

Count

2023

Channel Catfish

Non-vulnerable 8 - 10"

5000

2023

Striped Bass x White Bass (Wiper)

Fingerling 1 - 3"

5836

2024

Channel Catfish

Advanced Fingerling 4 - 7"

5000

2024

Striped Bass x White Bass (Wiper)

Fingerling 1 - 3"

6278

2024

Walleye x Sauger (Saugeye)

Fingerling 1 - 3"

30220


Additional information for stocking on Forbes Lake - SFSP


Fishing Outlook  ( Full PDF Report )

Click here for a list of all reports.

Species

Rank

Fish Status

BLUEGILL

Poor

The size structure of the bluegill population remained poor and continued to be comprised almost entirely of fish less than 7.5” in length. Overall body condition decreased slightly, but body condition continued to remain much higher for smaller fish (< 6” Wr=96) than larger fish (≥ 6” Wr = 87). The bluegill population in this lake will likely always be hindered by gizzard shad. Anglers can expect most fish to be between 5” – 7” long and weigh 0.1 – 0.25 pounds.

CHANNEL CATFISH

Very Good

Catfish remain abundant in Forbes Lake and should provide good fishing opportunities in the coming year. Body condition (Wr=90) declined to the lake management plan minimum target and electrofishing catch rates increased to 28 per hour. Approximately 97% of the adult channel catfish collected were 14” or longer and 34% exceeded 18”. Most fish in 2025 will range from 1 – 4 pounds with larger fish exceeding 6 pounds. This lake provides many bank fishing opportunities. Drift fishing the main lake is also very productive.

HYBRID STRIPED BASS (WIPERS)

Fair

Hybrid striped bass are also uncommon in the annual Forbes Lake surveys, but spring gillnetting catch rates in 2023 and 2024 were above average. Approximately 62% of the adult hybrid striped bass collected exceeded the 17” minimum length limit. Most hybrid striped bass caught in 2025 are expected to be more than 14” long and fish over the 17” minimum length should exceed 2.6 pounds. Hybrid striped bass fishing in 2025 will likely be poor to fair.

LARGEMOUTH BASS

Average

On April 01, 2019, the 14” – 18” protected slot limit was replaced by a 14” minimum length limit. Following the removal of the slot limit, the bass population size structure has declined. In the 2024 survey, approximately 47% of the adult bass in the sample were longer than 12” in length, 31% of the adult bass collected were 14” or longer, and only 5% exceeded 18” in length (42% of the 2018 value when the slot limit was still in place). The electrofishing catch rate remained stable at 100 per hour and exceeded the lake management plan target of 60 per hour. Average body condition remained above lake management plan target and bass longer than 14” had much higher average body condition than bass less than 14” long. For 2025, anglers can expect most bass over 14” to weigh between 1.4 – 5 pounds and bass in the 9” – 12” range should also be abundant.

SAUGEYE (Walleye/Sauger Hybrid)

Fair

Saugeye are not very common in the annual Forbes Lake surveys. Approximately 89% of the adult saugeye surveyed in 2024 were over the 14” minimum. Gillnetting catch rates improved to 7.3 fish per net-night and electrofishing catch rates doubled to 1.5 hour. Saugeye surveyed in the spring had very good average body condition (Wr=99) and those surveyed in the fall had lower body condition (Wr=91). Most saugeye over the 14” minimum should weigh 1 – 3 pounds and a few larger fish may be caught. Saugeye fishing in 2025 will likely be poor to fair.

WHITE CRAPPIE

Good

The size structure of the white crappie population remained relatively poor, but crappie continued to be very abundant. Average body condition for all sizes of crappie increased to the lake management plan target. In 2024, 54% of the crappie collected were less than 8” long and 46% exceeded 8”. Approximately 51.3% of the total crappie collected were between 6” – 8”, while 30.3% were between 8” – 9” (81.6% between 6” – 9”). Crappie exceeding 9” long comprised 16% of the adult fish collected in 2024 and 10% exceeded 10” long. Crappie fishing in 2025 should be good for catching abundant numbers and anglers can expect most fish to range from 6” – 9” in length with a few larger fish over 10”. There is no creel limit on crappie under 8” in length, but only 10 crappie 8” in length and longer may be harvested per day. Harvest of crappie less than 8” is strongly encouraged.

Location: Forbes Lake is located in Marion County, approximately 13 miles northeast of Salem Illinois.

Description: Forbes Lake was constructed in Stephen A. Forbes State Park near Salem in 1963. The Lake has a surface area of 585 acres, a maximum depth of 31 feet, and a mean depth of 12 feet. The lake has 18 miles of shoreline and a watershed of 13,800 acres.

History and Status of the Sport Fishery: The sport fish population in Forbes Lake is comprised primarily of largemouth bass, bluegill, white crappie, and channel catfish. The lake is stocked annually with saugeye (walleye/sauger hybrid), channel catfish, and hybrid striped bass (wiper). The lake also contains a strong population of yellow bullhead and large common carp (20+ lbs.). The fish population is surveyed annually, and summaries below are based on the results of the most recent population survey and four-year trends in the population indices.

Additional Lake Information: Two pole and line fishing only.

Site Regulations:
Largemouth Bass: 6 fish daily limit; 14" minimum length limit
Striped, White, or Hybrid Striped Bass: 3 fish daily limit; 17" minimum length limit
Channel Catfish: 6 fish daily limit, no length limit
Black, White, or Hybrid Crappie: 10 fish daily limit 8" or longer. Unlimited creel on crappie under 8"
Saugeye: 6 fish daily limit; 14" minimum length limit


Contact Information:
Stephen A. Forbes State Park
618-547-3381
IDNR Fisheries Biologist, Boone LaHood
618-393-6732

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.

2025 Approved or Pending Tournaments
Start Date ID Approval Ramp Location Bank/Boat
Hook/Bow
Max Boats Species Youth? Open to Public?
April-0328589ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
April-0628578ApprovedEast Launch (Dam Area) boat
hook
12Largemouth Bass
NoNo
April-1028590ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
April-1728591ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
April-2428592ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
April-2627578ApprovedEast Launch (Dam Area) boat
hook
15Largemouth Bass
NoNo
May-0128593ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
May-0828594ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
May-1528197ApprovedEast Launch (Dam Area) boat
hook
22Largemouth Bass
Smallmouth Bass
YesNo
May-1727982ApprovedEast Launch (Dam Area) boat
hook
15Largemouth Bass
NoYes
May-1827964ApprovedEast Launch (Dam Area) boat
hook
15Largemouth Bass
NoYes
May-2228596ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
May-2928597ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
June-0127625ApprovedEast Launch (Dam Area) boat
hook
15Largemouth Bass
NoNo
June-0528598ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
June-0727821ApprovedEast Launch (Dam Area) boat
hook
20Largemouth Bass
NoNo
June-0827586ApprovedEast Launch (Dam Area) boat
hook
10Largemouth Bass
NoNo
June-0828672PendingEast Launch (Dam Area) boat
hook
6Largemouth Bass
NoNo
June-1228599ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
June-1427891ApprovedEast Launch (Dam Area) boat
hook
20Largemouth Bass
NoYes
June-1928600ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
June-2128284ApprovedEast Launch (Dam Area) boat
hook
10Largemouth Bass
NoNo
June-2227477ApprovedEast Launch (Dam Area) boat
hook
15Largemouth Bass
NoNo
June-2628601ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
June-2927361ApprovedEast Launch (Dam Area) boat
hook
20Largemouth Bass
NoNo
July-0328602ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
July-1028603ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
July-1728604ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
July-1927736ApprovedEast Launch (Dam Area) boat
hook
15Largemouth Bass
NoNo
July-2428605ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
July-3128606ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
August-0728607ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
August-1027404ApprovedEast Launch (Dam Area) boat
hook
20Largemouth Bass
NoNo
August-1428608ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
August-1627892ApprovedEast Launch (Dam Area) boat
hook
20Largemouth Bass
NoYes
August-2128609ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
August-2327583ApprovedEast Launch (Dam Area) boat
hook
15Largemouth Bass
NoNo
August-2828610ApprovedWest Launch (no tournaments) boat
hook
20Largemouth Bass
NoYes
September-2028341ApprovedEast Launch (Dam Area) boat
hook
25Largemouth Bass
NoNo
September-2727983ApprovedEast Launch (Dam Area) boat
hook
15Largemouth Bass
NoYes
September-2827965ApprovedEast Launch (Dam Area) boat
hook
15Largemouth Bass
NoYes
October-18
*October-19
27684ApprovedEast Launch (Dam Area) boat
hook
15Largemouth Bass
NoNo