Minnesota · Aitkin County
Big Sandy Lake Fishing guide
Big Sandy Lake sits in Aitkin County, Minnesota, and covers 6,125 acres, reaching 84 ft at its deepest point. Secchi readings average around 4.5 ft of visibility. The Minnesota DNR has surveyed the lake 43 times, most recently in 2025, with walleye, largemouth bass, smallmouth bass and northern pike in the nets.
DNR survey data
Fish species
WalleyeGood numbers5.7per gill net13"Typical28"Biggest
Lengths measured · 12135 fish
Recent · 2021 + 2022 + 2023Lengths measured · 324 fish
2025Lengths measured · 460 fish
2025Lengths measured · 289 fish
2024Lengths measured · 591 fish
2023No recent survey rating.
Northern pikeJust a few4per gill net17"Typical37"Biggest
Lengths measured · 226 fish
Recent · 2021 + 2022 + 2023Lengths measured · 56 fish
2023Lengths measured · 85 fish
2022Lengths measured · 85 fish
2021Lengths measured · 52 fish
2020Last recorded in the 2013 survey and not seen since.
BluegillJust a few2.6per trap net8"Typical10"Biggest
Lengths measured · 105 fish
Recent · 2021 + 2022Lengths measured · 80 fish
2022Lengths measured · 25 fish
2021Lengths measured · 127 fish
2018Lengths measured · 24 fish
2016CrappieJust a few1.4per trap net10"Typical13"Biggest
Lengths measured · 69 fish
Recent · 2021 + 2022 + 2023Lengths measured · 3 fish
2023Only 3 fish measured that year — too few to read as a shape.
Lengths measured · 30 fish
2022Lengths measured · 36 fish
2021Lengths measured · 6 fish
2020Only 6 fish measured that year — too few to read as a shape.
Yellow perchGood numbers5.8per gill net8"Typical11"Biggest
Lengths measured · 338 fish
Recent · 2021 + 2022 + 2023Lengths measured · 35 fish
2023Lengths measured · 172 fish
2022Lengths measured · 131 fish
2021Lengths measured · 240 fish
2020Rock bassGood numbers0.9per trap net8"Typical11"Biggest
Lengths measured · 64 fish
Recent · 2021 + 2022 + 2023Lengths measured · 6 fish
2023Only 6 fish measured that year — too few to read as a shape.
Lengths measured · 36 fish
2022Lengths measured · 22 fish
2021Lengths measured · 18 fish
2020Channel catfishGood numbers3.8per gill net17"Typical29"Biggest
Lengths measured · 172 fish
Recent · 2021 + 2022 + 2023Lengths measured · 80 fish
2023Lengths measured · 90 fish
2022Lengths measured · 2 fish
2021Only 2 fish measured that year — too few to read as a shape.
Lengths measured · 13 fish
2020Rates 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 Big Sandy Lake through the year
Walleye
- Spring
- Walleye are shallow, on and just off the spawning flats and the first green weeds.
- 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 84 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.
Smallmouth bass
- Spring
- Smallmouth are on shallow rock, gravel and sand where they spawn.
- Early summer
- Smallmouth are post-spawn on rock points, gravel bars and the adjacent breaks.
- Summer
- Smallmouth are on rock humps, points and hard-bottom breaks. On a lake that drops to 84 ft, check the deep edge of that structure too.
- Fall
- Smallmouth are bunched tight on deep rock, so find one and you have found the school.
Season patterns for each species. Open the live map for today's wind, light and water temp.
Size history
Biggest fish by survey year
| Survey year | Walleye | Smallmouth bass | Northern pike |
|---|---|---|---|
| 2025 | 19" | — | — |
| 2024 | 17" | — | — |
| 2023 | 26" | 13" | 36" |
| 2022 | 28" | — | 37" |
| 2021 | 27" | 15" | 27" |
| 2020 | 23" | 20" | 35" |
| 2019 | 16" | — | — |
| 2018 | 16" | 19" | 33" |
Longest fish measured by DNR survey crews in each year's nets. Survey gear samples the population, so the lake usually holds larger fish than any survey measured.
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
Smallmouth bass · Soft plastics
Ned Rig
2.75" finesse stickbait or craw-style Ned bait
Smallmouth bass · Soft plastics
Drop Shot (Finesse Plastic)
4" finesse worm or 3" minnow-profile plastic
Northern pike · Soft plastics
Paddletail Swimbait on Jighead
4–5" paddletail swimbait on a ball-head swimbait jighead
Northern pike · Jigs & bladed
Spinnerbait
3/8–1/2 oz safety-pin spinnerbait with tandem willow-leaf blades
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
A temperature - dissolved oxygen (TDO) profile was collected on 7/31/2025 to measure the amount of thermal habitat available for Tullibee in Bill Horn Bay. The TDO3 (temperature at 3 mg/l dissolved oxygen) was determined to be 19.4 degrees C, which is typical of historical profiles. Comparing profiles collected since 2011, the least amount of available Tullibee habitat occurred in 2012, which likely represents a near-worst case scenario given the extreme weather conditions experienced that year. The lake provides "fair" habitat compared to other lakes in the Aitkin management area that are monitored. Because the management area is located near the southern edge of Minnesota's Tullibee range, TDO profiles should continue to be collected to monitor the availability of cold-water habitat.
Narrative text from the Minnesota DNR lake survey.
Recent reports
Big Sandy Lake fishing reports
Recent reports on Big Sandy 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.
Open the live map → Fished it lately? Write a report
All Big Sandy Lake fishing reports → · Aitkin County reports
Public water access
Getting on the water
- Big Sandy Lake (E) (trailer launch)
- Big Sandy Lake (N) (trailer launch)
- Big Sandy Lake (S Central) (trailer launch)
- Sandy River, Hwy 65 (trailer launch)
DNR bathymetry
Big Sandy Lake depth map
Within 30 miles
Nearby lakes
- Minnewawa Lake · 2,351 ac · 3.2 mi
- Aitkin Lake · 659 ac · 3.5 mi
- Rat Lake · 431 ac · 3.6 mi
- Glacier Lake · 135 ac · 4 mi
- Horseshoe Lake · 240 ac · 4.4 mi
- Round Lake · 554 ac · 5.9 mi
- Remote Lake · 134 ac · 6 mi
- Loon Lake · 34 ac · 6.8 mi
Quick answers
Frequently asked questions
How deep is Big Sandy Lake?
Big Sandy Lake reaches 84 ft at its deepest point with a mean depth of 21.4 ft; about 54% of the lake is littoral (15 ft or shallower).
How big is Big Sandy Lake?
Big Sandy Lake covers 6,125 acres with about 57 miles of shoreline.
How clear is the water in Big Sandy Lake?
DNR Secchi readings on Big Sandy Lake average 4.5 ft of visibility, middling clarity for a Minnesota lake.
What fish are in Big Sandy Lake?
Minnesota DNR surveys (most recently 2025) record walleye, largemouth bass, smallmouth bass, northern pike, muskellunge, bluegill, crappie, yellow perch, rock bass, channel catfish.
Is Big Sandy Lake stocked?
No stocking is on record for Big Sandy Lake in the DNR's stocking database.
Does Big Sandy Lake have a public access?
Yes. Big Sandy Lake has 4 public access sites, including Big Sandy Lake (E) (trailer launch).
How big do walleye get in Big Sandy Lake?
The biggest walleye measured in recent DNR surveys taped 28"; the size-history table on this page tracks the biggest fish in each survey back to 2018.
When was Big Sandy Lake last surveyed?
The Minnesota DNR last surveyed Big Sandy Lake in 2025, the most recent of 43 surveys on record.
Page updated .
Featured guide spot
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The live map adds today's conditions and ranked spots for Big Sandy Lake, plus a trip plan you can share:
Open Big Sandy Lake on the live map → Fished it lately? Write a report