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Diamond Lake
Enhanced dataInteractive depth contours
Diamond LakeBayfield County, WI
Contours load with map Access
Interactive depth contours10-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 99% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 83-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 Diamond Lake.
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Fishing forecast
Best windows for Diamond 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
Diamond 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 Diamond Lake - Deep Hole-South.
Sampled Sep 2025Volunteer monitoring since 1992
Clear, low-algae water — summer clarity of 14 ft is clearer than most monitored Wisconsin lakes.
Based on July–August 2025 averages across 8 volunteer readings.38Oligotrophic5-yr summer TSI
Very clear, low-nutrient water — often deep, with limited plant growth.
Water claritySecchi disk depth
14 ftJul–Aug 2025 avg (4 readings)
ClearStable since 2018
Clearer than 73% of 596 monitored Wisconsin lakes with current readings.
AlgaeChlorophyll-a
1.5 µg/LJul–Aug 2025 avg (4 readings)
Very lowImproving — down ~21% vs earlier years
NutrientsTotal phosphorus — fuels plant & algae growth
11 µg/LLatest single sample · 2024-09-09
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 | 14.0 ft (4) | 1.5 µg/L (4) | — |
| 2024 | 11.0 ft (1) | 3.0 µg/L (1) | 12.0 µg/L (1) |
| 2023 | 14.3 ft (3) | 1.5 µg/L (2) | — |
| 2022 | 14.2 ft (5) | 2.6 µg/L (5) | 11.0 µg/L (1) |
| 2021 | 11.6 ft (2) | 2.0 µg/L (1) | — |
| 2020 | 12.0 ft (1) | 3.0 µg/L (1) | — |
| 2019 | 12.8 ft (2) | 2.0 µg/L (3) | — |
| 2018 | 12.0 ft (3) | 2.3 µg/L (3) | — |
| 2017 | 11.2 ft (3) | 3.3 µg/L (3) | — |
| 2016 | 8.3 ft (2) | 4.0 µg/L (2) | — |
Latest individual samples: Secchi 12.5 ft (2025-09-11), chlorophyll-a 3 µg/L (2025-09-11), and total phosphorus 11 µg/L (2024-09-09).
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.
Diamond Lake - Deep Hole-SouthStation 043126 · 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
Diamond Lake depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Diamond 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 2897100 · 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 2025 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 fisheries survey in 2024 plus a May 2024-March 2025 creel survey; each metric carries its fish-survey or creel-survey scope.
DNR documented moderate adult-walleye density with low total exploitation, moderate bass populations, low northern-pike/black-crappie abundance and high bluegill abundance; angling pressure was high.
- The report spans two survey years; surveyYear is 2025 while fish-community metrics explicitly retain 2024 scope.
- Creel effort/catch/harvest values are species-directed estimates and are not survey CPUE.
- Historical stocking, historical survey comparators and extrapolated narrative values are excluded.
Black crappie
29 fishTotal captured · p. 95.6 inchesMinimum captured length · p. 911 inchesMaximum captured length · p. 97 inchesMean captured length · p. 9
Bluegill
1.4 inchesMinimum captured length · p. 108.7 inchesMaximum captured length · p. 1036 indexProportional stock density at 6 inches · p. 10144 fish/mileSurvey CPUE · p. 10
Green sunfish
1 fishTotal captured · p. 10
Largemouth bass
127 fishTotal captured · p. 62.2 inchesMinimum captured length · p. 620.1 inchesMaximum captured length · p. 663 indexProportional stock density at 12 inches · p. 6
Muskellunge
2 fishTotal captured · p. 10
Northern pike
9.3 inchesMinimum captured length · p. 931.2 inchesMaximum captured length · p. 919.6 inchesMean captured length · p. 90.8 fish/net-nightSurvey CPUE · p. 9
Pumpkinseed
17 fishTotal captured · p. 10
Rock bass
5 fishTotal captured · p. 10
Smallmouth bass
32 fishTotal captured · p. 82.7 inchesMinimum captured length · p. 819.5 inchesMaximum captured length · p. 813.8 inchesMean captured length · p. 8
Walleye
556 adult fishAdult population estimate · p. 31.6 adult fish/acreAdult density estimate · p. 31.4 fish/mileAge-1 CPUE · p. 30 fishAge-0 fish captured · p. 3
White crappie
1 fishTotal captured · p. 10
Yellow bullhead
10 fishTotal captured · p. 10
Yellow perch
44 fishTotal captured · p. 10
Diamond Lake Comprehensive Survey 2024-2025Matched by exact wbic and name county · WBICs 2897100 · verified 2026-07-19Wisconsin DNR fisheries survey report; LakeList operator documented permission to leverage this report with source attribution.
Aquatic invasive species
DNR observations
Verified observations are kept separate from species the DNR lists as no longer observed.
1 currently observed speciesClean, drain, and dry boats and gear before moving to another waterbody.
322surface acres
83max depth feet
1public access points
46.2627, -91.1453latitude, longitude
Access
Public access points
Boat launchDiamond Lake Access46.25221, -91.13914Managed by TOWNSHIPTOWN OF GRAND VIEWRamp surface: GravelADA-accessible feature: NoVerified 2026-07-12
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
Largemouth BassPanfishSmallmouth BassNorthern PikeWalleye
Wisconsin DNR stocking
Fish stocking history
The latest published year is 2025, when 1,609 fish were recorded across 1 entry.
2025
WalleyeLake Superior · Large Fingerling
1,6096.8 in average
2023
WalleyeLake Superior · Large Fingerling
1,6107.0 in average
2021
WalleyeMississippi Headwaters · Large Fingerling
1,8886.3 in average
2019
WalleyeMississippi Headwaters · Large Fingerling
1,6126.3 in average
2017
WalleyeMississippi Headwaters · Large Fingerling
1,6116.4 in average
2015
WalleyeMississippi Headwaters · Large Fingerling
1,6088.0 in average
2013
WalleyeMississippi Headwaters · Large Fingerling
1,7056.8 in average
2012
WalleyeMississippi Headwaters · Large Fingerling
1,7057.5 in average
2011
WalleyeMississippi Headwaters · Large Fingerling
1,5366.6 in average
2010
WalleyeMississippi Headwaters · Large Fingerling
1,6507.6 in average
Depth FAQ
How deep is Diamond Lake?
Diamond Lake is 83 feet deep at its deepest point and averages about 33 feet, according to Wisconsin DNR records.
Is there a free depth map of Diamond Lake?
Yes. LakeList publishes a free interactive depth contour map of Diamond Lake at a typical 10-foot interval, with an optional 3D underwater view, derived from C-MAP Genesis community sonar (derived) survey data.
Where does the Diamond 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 2026-05-25
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