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Trude Lake
Enhanced dataInteractive depth contours
Trude LakeIron 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 15% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 48-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 Trude Lake.
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Fishing forecast
Best windows for Trude 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
Trude 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.
Wisconsin DNR water assessment
Public-health advice and impairment listed
The DNR assessment indicates specific public-health advice for this waterbody. Review current official guidance before your trip or eating your catch.
303(d) / impairment recordSpecific public-health advice
Mercury Contaminated Fish TissuePollutants: Mercury
- Status
- 303d Listed
- Public health
- Specific Advice
- Recreation
- Full Body Contact
- 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 Turtle Flambeau Flowage - Trude Lake - Deep Hole.
Sampled Jun 2026Volunteer monitoring since 2011
Clear, low-algae water — summer clarity of 11.5 ft is clearer than most monitored Wisconsin lakes.
Based on July–August volunteer averages from 2024–2025; each value shows its own year.41Mesotrophic5-yr summer TSI
Moderately clear with moderate nutrients — a typical profile for good swimming lakes.
Water claritySecchi disk depth
11.5 ftJul–Aug 2024 avg (2 readings)
ClearImproving — up ~15% vs earlier years
Clearer than 64% of 596 monitored Wisconsin lakes with current readings.
AlgaeChlorophyll-a
3.5 µg/LJul–Aug 2025 avg (2 readings)
LowWorsening — up ~31% vs earlier years
NutrientsTotal phosphorus — fuels plant & algae growth
13 µg/LLatest single sample · 2025-06-23
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 | 13.0 ft (1) | 3.5 µg/L (2) | — |
| 2024 | 11.5 ft (2) | 3.5 µg/L (2) | — |
| 2023 | 12.5 ft (3) | 3.5 µg/L (2) | — |
| 2022 | 9.3 ft (4) | 3.5 µg/L (2) | — |
| 2021 | 12.6 ft (4) | 1.5 µg/L (2) | 10.0 µg/L (1) |
| 2020 | 10.2 ft (3) | 3.0 µg/L (2) | — |
| 2019 | 8.9 ft (4) | 2.5 µg/L (2) | — |
| 2018 | 8.6 ft (4) | 1.5 µg/L (2) | — |
| 2017 | 9.4 ft (4) | 4.0 µg/L (2) | — |
| 2016 | 8.1 ft (4) | 3.5 µg/L (2) | — |
Latest individual samples: Secchi 11 ft (2026-06-20), chlorophyll-a 4 µg/L (2026-06-19), and total phosphorus 13 µg/L (2025-06-23).
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.
Turtle Flambeau Flowage - Trude Lake - Deep HoleStation 263052 · 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 sheetFishing 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
Trude Lake depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Trude 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 2295200 · 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.
Official fishing intelligence
Fishing reports and forecasts
LakeList matched these official resources by exact lake name and county. Report text stays with the publisher.
Forecasts describe DNR survey findings and expected opportunities; they are not real-time catch reports or a guarantee of fishing conditions.
786surface acres
48max depth feet
1public access points
46.1132, -90.1543latitude, longitude
Access
Public access points
Boat launchTrude Lake Access46.11008, -90.14775Managed by STATE(DNR)TOWN OF MERCERRamp surface: ConcreteADA-accessible feature: NoVerified 2026-07-12
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
Northern PikeWalleyeMuskyPanfishSmallmouth BassLargemouth Bass
Wisconsin DNR stocking
Fish stocking history
The latest published year is 2017, when 64 fish were recorded across 1 entry.
2017
MuskellungeUpper Chippewa River · Large Fingerling
6411.3 in average
2015
MuskellungeUpper Chippewa River · Large Fingerling
39112.2 in average
2011
MuskellungeUpper Chippewa River · Large Fingerling
3909.9 in average
Depth FAQ
How deep is Trude Lake?
Trude Lake is 48 feet deep at its deepest point and averages about 14 feet, according to Wisconsin DNR records.
Is there a free depth map of Trude Lake?
Yes. LakeList publishes a free interactive depth contour map of Trude 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 Trude 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 Pagesname, coordinates, county, source identifiers
LakeList record updated 2026-07-12
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