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Forest Lake
Enhanced dataInteractive depth contours
Forest LakeVilas 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 97% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 60-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 Forest Lake.
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Fishing forecast
Best windows for Forest Lake
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
Forest Lake water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
71°FWarm
Seasonal estimate. Checking current National Weather Service air temperatures…
Comfortable summer pattern. Bass and panfish are active; early and late hours beat the midday heat.
Estimates are modeled, not measured. Actual temperatures vary with depth, wind mixing, and recent weather — verify conditions before swimming, boating, or heading onto ice.
DNR water check
Water quality quick take
From Wisconsin DNR / Citizen Lake Monitoring readings at Forest Lake - Deep Hole.
Sampled Jun 2026Volunteer monitoring since 1990
Very clear, low-algae water — summer clarity of 21.5 ft puts it among the clearest tenth of monitored Wisconsin lakes.
Based on July–August volunteer averages from 2024–2025; each value shows its own year.37Oligotrophic5-yr summer TSI
Very clear, low-nutrient water — often deep, with limited plant growth.
Water claritySecchi disk depth
21.5 ftJul–Aug 2024 avg (2 readings)
Crystal clearStable since 2018
Clearer than 96% of 596 monitored Wisconsin lakes with current readings.
AlgaeChlorophyll-a
2.5 µg/LJul–Aug 2025 avg (2 readings)
Very lowWorsening — up ~18% vs earlier years
NutrientsTotal phosphorus — fuels plant & algae growth
13 µg/LLatest single sample · 2026-06-15
LowLow phosphorus means light plant/algae growth pressure.
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 | 22.0 ft (1) | 2.5 µg/L (2) | 12.0 µg/L (1) |
| 2024 | 21.5 ft (2) | 2.0 µg/L (1) | — |
| 2023 | 21.3 ft (3) | 2.0 µg/L (3) | — |
| 2022 | 23.0 ft (1) | 2.0 µg/L (2) | — |
| 2021 | 21.0 ft (2) | 1.5 µg/L (2) | — |
| 2020 | 21.3 ft (3) | 2.0 µg/L (1) | — |
| 2019 | 18.5 ft (1) | 2.5 µg/L (2) | — |
| 2018 | 24.0 ft (1) | — | — |
| 2017 | 19.3 ft (3) | 2.0 µg/L (2) | — |
| 2016 | 16.9 ft (2) | 0.5 µg/L (2) | — |
Latest individual samples: Secchi 22 ft (2025-07-15), chlorophyll-a 1 µg/L (2026-06-15), and total phosphorus 13 µg/L (2026-06-15).
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.
Forest Lake - Deep HoleStation 643449 · 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
Forest Lake depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Forest Lake · 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 2762200 · 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.
468surface acres
60max depth feet
1public access points
46.1489, -89.3763latitude, longitude
Access
Public access points
Boat launchForest Lake Boat Launch46.15480, -89.36719Managed by TOWNSHIPTOWN OF LAND O LAKESRamp surface: GravelADA-accessible feature: NoVerified 2026-07-12
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
PanfishWalleyeLargemouth BassNorthern PikeSmallmouth Bass
Depth FAQ
How deep is Forest Lake?
Forest Lake is 60 feet deep at its deepest point and averages about 29 feet, according to Wisconsin DNR records.
Is there a free depth map of Forest Lake?
Yes. LakeList publishes a free interactive depth contour map of Forest Lake 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 Forest Lake 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