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Lake Montanis
Enhanced dataInteractive depth contours
Lake MontanisBarron County, WI
Contours load with map Access
Interactive depth contours5-foot typical interval · Sonar-derived depth (C-MAP Genesis) · Gaps interpolated · Not for navigation
Source: C-MAP Genesis community sonar (derived)high confidence · QA passed · Select a contour to inspect its mapped depthDepths decoded from C-MAP Genesis Social Map community sonar recordings (used with permission), covering 86% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 14-ft maximum depth. More accurate than a pure model, but still an estimate. Not for navigation.LakeList assistant
Plan your lake day
Fishing spots, food, lodging, marinas, and rentals around Lake Montanis.
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Fishing forecast
Best windows for Lake Montanis
Weather-based planning built from the National Weather Service hourly forecast near this lake.
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Checking wind, precipitation, and near-term weather windows.
Water temperature
Lake Montanis water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
77°FPeak summer
Seasonal estimate. Checking current National Weather Service air temperatures…
Warmest water of the year. Fish hold deeper or feed in low light; swimming and watersports are at their best.
Estimates are modeled, not measured. Actual temperatures vary with depth, wind mixing, and recent weather — verify conditions before swimming, boating, or heading onto ice.
Wisconsin DNR water assessment
Impaired waterbody listed
The DNR lists this waterbody as impaired. This notice is not itself a closure; review the official assessment and current guidance before your trip.
303(d) / impairment recordRecreation restrictions noted
Excess Algal Growth, EutrophicationPollutants: Total Phosphorus
- Status
- 303d Listed
- Public health
- General Advice
- Recreation
- Recreational Restrictions
- Aquatic life
- Not specified
Water is impaired due to one or more pollutants and associated quality impacts.
Review DNR water quality Check consumption advice Source updated 2026-03-25 · LakeList verified 2026-07-12
DNR water check
Water quality quick take
From Wisconsin DNR / Citizen Lake Monitoring readings at Lake Montanis - Deep Hole.
Sampled Jun 2026Volunteer monitoring since 2001
Murky, algae-prone water — summer clarity of 1.5 ft ranks among the lowest of monitored Wisconsin lakes.
Based on July–August volunteer averages from 2022–2025; each value shows its own year.66Eutrophic5-yr summer TSI
Nutrient-rich, greener water — more algae and plant growth, common in shallower lakes.
Water claritySecchi disk depth
1.5 ftJul–Aug 2022 avg (2 readings)
MurkyDeclining — down ~29% vs earlier years
Clearer than 9% of 596 monitored Wisconsin lakes with current readings.
AlgaeChlorophyll-a
51 µg/LJul–Aug 2025 avg (2 readings)
HighWorsening — up ~92% vs earlier years
No recent nutrient readings — last measured 2020.
Listed as impaired on the DNR/EPA water-condition assessment — see the notice on this page for details.All readings by year · station details · methodology
Summer averages (July/August)
July/August means; counts in parentheses show how many samples went into each average.
| Year | Secchi | Chlorophyll-a | Total phosphorus |
|---|---|---|---|
| 2025 | 2.0 ft (1) | 51.0 µg/L (2) | — |
| 2024 | — | 24.5 µg/L (2) | — |
| 2023 | 2.0 ft (1) | 108.0 µg/L (2) | — |
| 2022 | 1.5 ft (2) | 48.0 µg/L (1) | — |
| 2021 | 2.5 ft (1) | 30.0 µg/L (2) | — |
| 2020 | 2.5 ft (2) | 17.5 µg/L (2) | — |
| 2019 | 2.8 ft (2) | 45.0 µg/L (1) | — |
| 2018 | 3.5 ft (2) | 45.0 µg/L (2) | — |
| 2017 | 3.3 ft (2) | 23.0 µg/L (2) | — |
| 2016 | 3.0 ft (2) | 37.0 µg/L (2) | — |
Latest individual samples: Secchi 3 ft (2026-06-22), chlorophyll-a 25 µg/L (2026-06-22), and total phosphorus 36 µg/L (2020-06-24).
Secchi clarity is how deep a black-and-white disk stays visible from the surface — more feet means clearer water.
Chlorophyll-a is an algae pigment; higher values signal more algae in the water column.
Total phosphorus is a nutrient that feeds algae and aquatic plants. It is not a weed survey — depth, bottom type, water movement, and management change the actual lake experience.
Lake Montanis - Deep HoleStation 033191 · TSI based on chlorophyll
Modeled from DNR/CLMN monitoring — not a safety or swim-condition report. Verify current conditions locally. LakeList verified 2026-07-12.Official Wisconsin information
Plan with DNR sources
LakeList links to the authoritative record so you can verify maps, rules, and current notices before leaving.
Historical DNR depth maps1 converted map sheetView DNR depth mapHistorical map · not for navigationFishing regulationsVerify current seasons, limits, and restrictionsOfficial DNR lake pageFacts, advisories, boating, and water qualityWater quality reportsMonitoring stations, clarity, and DNR reportsInvasive speciesVerified, observed, and historical AIS recordsBoating ordinancesLocal slow-no-wake and water-use restrictionsFish consumption advisoriesStatewide and waterbody-specific health guidance
Historical depth maps are not for navigation. Verify regulations and access at the official source before your trip.
Historical Wisconsin DNR maps
Lake Montanis depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Lake Montanis · sheet 1
Pan, zoom, and inspect the converted Wisconsin DNR historical map image in the browser. Historical survey — not for navigation.
Source: Wisconsin DNR · WBIC 2103200 · image navigation only; spatial alignment pending · Historical lake maps are not for navigation.
Source: Wisconsin Department of Natural Resources. Converted for browser access with source URLs, checksums, and retrieval dates retained. Historical lake maps are not for navigation.
Wisconsin DNR fisheries survey
Fish population survey
Structured LakeList extraction from the 2024 DNR fisheries survey. Population estimates, density, and catch-rate indices use different units, methods, and scopes, so each value is presented in its original form rather than normalized against a different measure.
Survey indicatorsValues keep their source unit and method; unlike measures are not scaled or compared.
Management contextLake-specific 2024 comprehensive Treaty assessment with spring fyke netting/electrofishing, late-spring bass/panfish electrofishing and fall juvenile-walleye electrofishing.
DNR found a stable low-to-moderate density adult-walleye population, limited pike and bass samples, and low-density bluegill and black-crappie populations with strong sample size structure.
- The methods section misdates the SE1 recapture event as April 26, 2022; event-specific dates are not promoted.
- Low bass and pike sample sizes and difficult SE2 conditions are preserved in interpretation; no unsupported population inferences are made.
- Historical comparators, theoretical growth maxima and management targets are excluded from current-survey metrics.
Black crappie
19 fishTotal captured · p. 1419 fish/mileSurvey CPUE · p. 1417 fish/mileCPUE for fish at least 8 inches long · p. 1489.5 percentShare at least 8 inches long · p. 14
Bluegill
98 fishTotal captured · p. 1298 fish/mileSurvey CPUE · p. 1279 fish/mileCPUE for fish at least 6 inches long · p. 1282.3 percentShare at least 6 inches long · p. 12
Largemouth bass
25 fishTotal captured · p. 107.1 fish/mileSurvey CPUE · p. 104 fish/mileCPUE for fish at least 14 inches long · p. 1011 inchesMinimum captured length · p. 10
Muskellunge
1 fishTotal captured · p. 1648 inchesCaptured fish length · p. 16
Northern pike
12 fishTotal captured · p. 100.2 fish/net-nightSurvey CPUE · p. 1010.5 inchesMinimum captured length · p. 1036.7 inchesMaximum captured length · p. 10
Smallmouth bass
15 fishTotal captured · p. 114.3 fish/mileSurvey CPUE · p. 112 fish/mileCPUE for fish at least 14 inches long · p. 1110.7 inchesMinimum captured length · p. 11
Walleye
298 adult fishAdult population estimate · p. 61.5 adult fish/acreAdult density estimate · p. 65 fish/net-nightSurvey CPUE · p. 67.7 inchesMinimum captured length · p. 6
Yellow perch
9 fishTotal captured · p. 16
Fishery Survey Report for Lake Montanis, Barron County, Wisconsin 2024Matched by exact wbic and name county · WBICs 2103200 · verified 2026-07-19Wisconsin DNR fisheries survey report; LakeList operator documented permission to leverage this report with source attribution.
Fishbrain community activity
Recent catch activity
Aggregated public catch activity matched to Lake Montanis. Exact catch locations and angler details are not shown.
Most reported species in this extract
Largemouth bass8Northern pike3Bluegill3Black crappie2Yellow perch2Muskellunge2Pumpkinseed1
Catch analytics
Seasonal fish catch patterns
Pick a species to see when anglers reported it, compare against all fish by month, then scan year-by-year catch volume.
Largemouth bass by monthMonthly reports tagged as Largemouth bass.
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
All fish by monthTotal public catch reports across every listed species.
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Yearly catch viewYear-by-year public catch volume.
No yearly catch aggregates yet.
Catch counts are community reports, not a population survey or a guarantee of current fishing conditions.
View source on Fishbrain212surface acres
14max depth feet
2public access points
45.4765, -91.7045latitude, longitude
Access
Public access points
Boat launchAccess (NE Access)45.47579, -91.70038Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess (SW Access)45.47116, -91.70473Managed by Wisconsin DNR
DNR verifiedDirections
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
Northern PikePanfishWalleyeLargemouth Bass
Wisconsin DNR stocking
Fish stocking history
The latest published year is 2021, when 7,729 fish were recorded across 1 entry.
2021
WalleyeMississippi Headwaters · Small Fingerling
7,7291.5 in average
2019
WalleyeMississippi Headwaters · Small Fingerling
8,2531.6 in average
2017
WalleyeMississippi Headwaters · Small Fingerling
8,1671.6 in average
2015
WalleyeMississippi Headwaters · Small Fingerling
7,4821.4 in average
2013
WalleyeMississippi Headwaters · Large Fingerling
1,0006.3 in average
2011
WalleyeMississippi Headwaters · Small Fingerling
7,0401.7 in average
Depth FAQ
How deep is Lake Montanis?
Lake Montanis is 14 feet deep at its deepest point and averages about 8 feet, according to Wisconsin DNR records.
Is there a free depth map of Lake Montanis?
Yes. LakeList publishes a free interactive depth contour map of Lake Montanis at a typical 5-foot interval, with an optional 3D underwater view, derived from C-MAP Genesis community sonar (derived) survey data.
Where does the Lake Montanis depth map come from?
The interactive depth contours are derived from C-MAP Genesis community sonar (derived). Each contour set passes a visual QA review against the source document before it is published. The depths are derived from community sonar recordings (C-MAP Genesis Social Map, used with permission), with gaps between recordings interpolated; not for navigation.
Trust and freshness
Where this lake data comes from
Wisconsin DNR Lake Mapsname, coordinates, county, source identifiers
LakeList record updated 2026-07-14
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