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Lake Delta
Enhanced dataInteractive depth contours
Lake DeltaBayfield 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 50% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 30-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 Delta.
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Fishing forecast
Best windows for Lake Delta
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 Delta water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
73°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
Historical volunteer-monitoring record for this lake.
Last sampled Aug 2019Volunteer monitoring 2008–2019
DNR volunteers monitored this lake for about 11 years, ending in 2019. In 2019 the water showed clear water (~15.1 ft Secchi). After 7 years without samples, these readings describe the lake as it was, not as it is.
| Year | Secchi | Chlorophyll-a | Total phosphorus |
|---|---|---|---|
| 2019 | 15.1 ft (4) | — | — |
| 2018 | 10.5 ft (3) | — | — |
| 2016 | 11.8 ft (3) | — | — |
| 2015 | 12.8 ft (3) | — | — |
| 2013 | 13.6 ft (6) | — | — |
| 2012 | 12.1 ft (4) | — | — |
Lake Delta - Deep HoleStation 043075
Historical record only — no current water-quality data exists for this lake. 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 Delta depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Lake Delta · 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 2901700 · 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 2023 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 May 24, 2023 late-spring electrofishing survey; all-species 0.7-mile and longer gamefish 5.3-mile efforts remain distinct.
DNR documented abundant bluegill and black crappie with useful size structure, and a low-density largemouth-bass population with good size structure.
- The priority index mislabeled this public PDF as George Lake; the PDF itself repeatedly identifies Lake Delta, Bayfield County, WBIC 2901700. It is intentionally excluded from George Lake and matched only to exact Lake Delta.
- Catch rates and percentages are retained exactly as printed; no counts are derived from rounded rates.
- Low-number other-species statements without exact counts are excluded.
Black crappie
40 fishTotal captured · p. 257 fish/mileSurvey CPUE · p. 25.8 inchesminimum captured length · p. 29.1 inchesmaximum captured length · p. 2
Bluegill
240 fishTotal captured · p. 1343 fish/mileSurvey CPUE · p. 12.1 inchesminimum captured length · p. 18.7 inchesmaximum captured length · p. 1
Largemouth bass
109 fishTotal captured · p. 221 fish/mileSurvey CPUE · p. 24.7 inchesminimum captured length · p. 220.5 inchesmaximum captured length · p. 2
Northern pike
4 fishTotal captured · p. 310.2 inchesminimum captured length · p. 323.3 inchesmaximum captured length · p. 3
Pumpkinseed
12 fishTotal captured · p. 32.4 inchesminimum captured length · p. 35.9 inchesmaximum captured length · p. 3
2023 Fisheries Information Sheet: Lake Delta, Bayfield CountyMatched by exact wbic name county after queue source identity correction · WBICs 2901700 · verified 2026-07-19Wisconsin DNR fisheries survey report; LakeList operator documented permission to leverage this report with source attribution.
167surface acres
30max depth feet
1public access points
46.4785, -91.3003latitude, longitude
Access
Public access points
Boat launchLake Delta Access46.47645, -91.30249Managed by COUNTYTOWN OF DELTARamp surface: Concrete PanelsADA-accessible feature: NoVerified 2026-07-12
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
PanfishLargemouth BassNorthern Pike
Depth FAQ
How deep is Lake Delta?
Lake Delta is 30 feet deep at its deepest point and averages about 10 feet, according to Wisconsin DNR records.
Is there a free depth map of Lake Delta?
Yes. LakeList publishes a free interactive depth contour map of Lake Delta 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 Delta 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