Minnesota · Lake County
Thomas Lake Fishing guide
Thomas Lake covers 1,465 acres in Lake County, Minnesota, reaching 110 ft at its deepest point. Average water clarity runs about 14 ft. The Minnesota DNR has surveyed the lake 4 times, most recently in 2025, with walleye, northern pike, bluegill and yellow perch in the nets.
DNR survey data
Fish species
WalleyeOne of the best around13.7per gill net18"Typical25"Biggest
Lengths measured · 82 fish
Northern pikeJust a few0.7per gill net25"Typical30"Biggest
Lengths measured · 10 fish
No recent survey rating.
Lake troutPresent (last recorded 2012)Last recorded in the 2012 survey and not seen since.
Last recorded in the 2012 survey and not seen since.
Lengths measured · 15 fish
Rates come from standard DNR survey gear (gill nets, trap nets, electrofishing), judged against statewide benchmarks for the same gear, so the same number of fish per net can read differently for two species. Where the standard gear can't count a species reliably, only presence and size are listed. Typical is the middle fish of those measured. Open a row for the full length spread, survey by survey.
How to fish Thomas Lake through the year
Walleye
- Spring
- Walleye are shallow, on and just off the spawning flats and the first green weeds. At 14 ft of clarity, fish them deeper and lighter than usual.
- Early summer
- Walleye are setting up on the outside weed edge, points and shallow structure.
- Summer
- Walleye are working the weed edge, points and any wind-blown structure. On a lake that drops to 110 ft, check the deep edge of that structure too.
- Fall
- Walleye are packing onto the sharpest breaks and points as the water cools, in big schools with short windows.
Northern pike
- Spring
- Pike are in the shallow bays and along new weed growth. At 14 ft of clarity, fish them deeper and lighter than usual.
- Early summer
- Pike are on the outside weed edge and points.
- Summer
- Pike are on the deep weed edge and points near the coolest water they can find. On a lake that drops to 110 ft, check the deep edge of that structure too.
- Fall
- Pike are on the last green weeds and the breaks beside them, feeding heavily as the water drops.
Season patterns for each species. Open the live map for today's wind, light and water temp.
Suggested tackle
What to bring
Top presentations for this lake's structure and clarity:
Walleye · Live bait
Live-Bait (Lindy) Rig + Leech/Crawler
jumbo leech or half a nightcrawler
Walleye · Trolling
Leadcore Line + Crankbaits
4–5" mid-diving crankbait behind a long leadcore run
Northern pike · Soft plastics
Paddletail Swimbait on Jighead
4–5" paddletail swimbait on a ball-head swimbait jighead
Northern pike · Muskie & pike
Soft Rubber (Bull Dawg / Medusa)
10" soft rubber body bait
Lake trout · Trolling
Trout Trolling (spoons/cowbells)
2–3in trolling spoon behind a small cowbell/dodger string
Lake trout · Jigs & bladed
Inline Spinner (Mepps/Blue Fox)
#2–#4 in-line spinner
Full setups, including hooks, weights and line, are on the live map. As an Amazon Associate I earn from qualifying purchases.
MN DNR · in their words
From the 2025 survey
Temperature and dissolved oxygen measurements were collected from the deepest basin in Thomas Lake on August 3rd, 2025. This was done to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Lake Trout, the most sensitive coldwater species present in this lake (Cisco, also known as 'Tullibee', are also present). Lake Trout require a layer of oxythermal habitat that contains water temperatures below 8.8 degrees C (47.8 degrees F) and dissolved oxygen concentrations above 3.0 mg/L. Based on data collected from the deepest basin (maximum sampled depth was 100.0 feet), the water temperature decreased to 8.8 degrees C (47.8 degrees F) at 36.9 feet and the dissolved oxygen concentration stayed greater than 3.0 mg/L for the entire sampled depth. This layer in the water column was 63.1 feet, indicating oxythermal habitat for Lake Trout was present.
Further, the temperature at which dissolved oxygen decreased to 3.0 mg/L (i.e., TDO3, a single variable to characterize oxythermal habitat) was never reached because dissolved oxygen remained above 3.0 mg/L throughout the sampled depths. In this case, the minimum temperature, 5.2 degrees C (41.4 degrees F), was substituted as TDO3. TDO3 values cooler than 8.8 degrees C (47.8 degrees F) indicate that oxythermal conditions were suitable for Lake Trout at the time of the survey.
Read the full DNR narrative
Data collected by the Minnesota Department of Natural Resources during the period of maximum oxythermal stress (July 26th to Aug 24th) in 2024 also indicated suitable oxythermal habitat. When adequate oxythermal habitat is not available, Lake Trout are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.
Narrative text from the Minnesota DNR lake survey.
Recent reports
Thomas Lake fishing reports
Recent reports on Thomas Lake from guides, tournaments and regular anglers. Anything posted in the last two weeks also bumps the matching spots on the live map, so you'll see a "matches a recent report" tag on them.
Public water access
Getting on the water
- US Forest Service access (permit required): Series of short portages from Hatchet Lk.
- DNR access (permit required): Navigable channel from Fraser Lk.
- US Forest Service access (permit required): 15 rod portage from Harmony Lk.
- US Forest Service access (permit required): 15 rod portage Kiana Lk.
- US Forest Service access (permit required): 240 rod portage from Cacabic Lk.
DNR bathymetry
Thomas Lake depth map
Within 30 miles
Nearby lakes
- Ima Lake · 742 ac · 2.5 mi
- Fraser Lake · 695 ac · 2.6 mi
- Alice Lake · 1,469 ac · 3.3 mi
- Jordan Lake · 142 ac · 3.3 mi
- Amber Lake · 121 ac · 3.6 mi
- Ahmakose Lake · 43 ac · 3.7 mi
- Gibson Lake · 33 ac · 4.3 mi
- Explorer Lake · 52 ac · 4.6 mi
Quick answers
Frequently asked questions
How deep is Thomas Lake?
Thomas Lake reaches 110 ft at its deepest point; about 30% of the lake is littoral (15 ft or shallower).
How big is Thomas Lake?
Thomas Lake covers 1,465 acres with about 26.2 miles of shoreline.
How clear is the water in Thomas Lake?
DNR Secchi readings on Thomas Lake average 14 ft of visibility, clear water for a Minnesota lake.
What fish are in Thomas Lake?
Minnesota DNR surveys (most recently 2025) record walleye, northern pike, bluegill, yellow perch, lake trout, rock bass.
Is Thomas Lake stocked?
No stocking is on record for Thomas Lake in the DNR's stocking database.
Does Thomas Lake have a public access?
Yes. Thomas Lake has 5 public access sites, including a US Forest Service access (Series of short portages from Hatchet Lk.).
How big do walleye get in Thomas Lake?
The biggest walleye measured in recent DNR surveys taped 25".
When was Thomas Lake last surveyed?
The Minnesota DNR last surveyed Thomas Lake in 2025, the most recent of 4 surveys on record.
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