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Deep Lake
Enhanced dataHistorical depth chart
Deep LakeWashburn County, WI
Historical source depth chart available1 converted source DNR map sheet can be panned and zoomed in the browser. Interactive contours stay hidden until visual QA passes. Historical survey — not for navigation.
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Fishing spots, food, lodging, marinas, and rentals around Deep Lake.
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Fishing forecast
Best windows for Deep 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
Deep Lake water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
74°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.
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
Impairment Unknown, Excess Algal GrowthPollutants: 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 Deep Lake - Deep Hole.
Sampled Nov 2025Volunteer monitoring since 1968
Clear, low-algae water — summer clarity of 10.5 ft is clearer than most monitored Wisconsin lakes.
Based on July–August 2025 averages across 4 volunteer readings.48Mesotrophic5-yr summer TSI
Moderately clear with moderate nutrients — a typical profile for good swimming lakes.
Water claritySecchi disk depth
10.5 ftJul–Aug 2025 avg (2 readings)
ClearImproving — up ~58% vs earlier years
Clearer than 67% of 597 monitored Wisconsin lakes with current readings.
AlgaeChlorophyll-a
3.5 µg/LJul–Aug 2025 avg (2 readings)
LowImproving — down ~78% vs earlier years
NutrientsTotal phosphorus — fuels plant & algae growth
16 µg/LLatest single sample · 2025-06-20
Low2017–2024
Low 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 | 10.5 ft (2) | 3.5 µg/L (2) | — |
| 2024 | 8.5 ft (2) | 5.0 µg/L (2) | 11.0 µg/L (1) |
| 2023 | 7.8 ft (5) | 5.0 µg/L (2) | — |
| 2022 | 9.9 ft (7) | 5.5 µg/L (2) | 13.0 µg/L (1) |
| 2021 | 4.1 ft (5) | 24.0 µg/L (1) | — |
| 2020 | 2.9 ft (7) | 33.0 µg/L (1) | — |
| 2019 | 5.7 ft (6) | 4.0 µg/L (1) | — |
| 2018 | 10.5 ft (6) | 3.0 µg/L (1) | — |
| 2017 | 7.1 ft (4) | 7.0 µg/L (1) | 16.0 µg/L (1) |
| 2016 | 7.2 ft (5) | 5.0 µg/L (1) | — |
Latest individual samples: Secchi 11.5 ft (2025-11-17), chlorophyll-a 5 µg/L (2025-08-24), and total phosphorus 16 µg/L (2025-06-20).
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.
Deep Lake - Deep HoleStation 663105 · 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
Deep Lake depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Deep 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 1844000 · 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.
43surface acres
25max depth feet
1public access points
45.7511, -91.5423latitude, longitude
Access
Public access points
Boat launchAccess45.76741, -91.77213Managed by Wisconsin DNR
DNR verifiedDirections
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
Largemouth BassPanfishMuskyWalleye
Wisconsin DNR stocking
Fish stocking history
The latest published year is 2023, when 494 fish were recorded across 1 entry.
2023
WalleyeChippewa/St. Croix · Large Fingerling
4947.0 in average
Depth FAQ
How deep is Deep Lake?
Deep Lake is 25 feet deep at its deepest point and averages about 13 feet, according to Wisconsin DNR records.
Is there a free depth map of Deep Lake?
Yes. 1 scanned Wisconsin DNR lake survey map sheet is free to view and zoom on LakeList. These historical surveys are not for navigation.
Where does the Deep Lake depth map come from?
The map sheets are converted from official Wisconsin DNR lake survey documents, with the source URL, checksum, and retrieval date retained for every sheet. Historical surveys are 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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