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Ludden Lake
Enhanced dataInteractive depth contours
Ludden LakeIowa 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 82% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 14-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 Ludden Lake.
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Fishing forecast
Best windows for Ludden 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
Ludden Lake water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
79°FPeak summer
Seasonal estimate. Checking current National Weather Service air temperatures…
Warmest water of the year. Fish hold deeper or feed in low light; swimming and watersports are at their best.
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 Ludden Lake - Deep Hole.
Sampled Mar 2025Volunteer monitoring since 1999
Murky, algae-prone water — summer clarity of 1 ft ranks among the lowest of monitored Wisconsin lakes.
Based on July–August volunteer averages from 2022–2024; each value shows its own year.73Hypereutrophic5-yr summer TSI
Very nutrient-rich water — heavy algae and plant growth pressure.
Water claritySecchi disk depth
1 ftJul–Aug 2022 avg (2 readings)
MurkyStable since 2017
Clearer than 2% of 596 monitored Wisconsin lakes with current readings.
AlgaeChlorophyll-a
25 µg/LJul–Aug 2024 avg (2 readings)
High2015–2024
NutrientsTotal phosphorus — fuels plant & algae growth
192.5 µg/LJul–Aug 2023 avg (2 readings)
High2015–2024
High phosphorus points to heavy 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 |
|---|---|---|---|
| 2024 | 2.0 ft (1) | 25.0 µg/L (2) | 119.0 µg/L (1) |
| 2023 | 2.0 ft (1) | 173.0 µg/L (2) | 192.5 µg/L (2) |
| 2022 | 1.0 ft (2) | — | — |
| 2021 | 1.5 ft (2) | — | — |
| 2020 | 1.8 ft (2) | — | — |
| 2019 | 1.8 ft (2) | — | — |
| 2018 | 2.2 ft (3) | — | — |
| 2017 | 2.0 ft (3) | — | — |
| 2015 | — | 58.5 µg/L (2) | 129.5 µg/L (2) |
| 2014 | 2.4 ft (2) | — | — |
Latest individual samples: Secchi 2 ft (2024-07-22), chlorophyll-a 37 µg/L (2024-08-27), and total phosphorus 113 µg/L (2025-03-31).
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.
Ludden Lake - Deep HoleStation 253168 · TSI based on Secchi
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
Ludden Lake depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Ludden 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 930700 · 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 August-October 2022 common-carp mark-recapture assessment plus spring 2023 fish survey. Queue WBIC 930700 and exact UUID gate insertion, but the report does not print a WBIC.
DNR estimated 9,568 common carp and very high carp biomass, documented an estimated 108 adult walleyes, and found increasingly abundant largemouth bass, bluegill and black crappie.
- The report prints no WBIC; migration insertion still requires the exact reviewed LakeList UUID/WBIC/WI/name/county.
- Figure captions incorrectly name Cox Hollow Lake; no values are taken from those mislabeled figures.
- The executive-summary bluegill 17.1 fish/mile value conflicts with the body/table current value of 75 and appears historical; only the repeated body/table 2023 value is retained.
- Walleye estimate CV is high and remains explicitly reported.
Black crappie
5,725 fishFyke-net catch · p. 9157.9 fish/net-nightFyke-net CPUE · p. 9169 fishElectrofishing catch · p. 9169 fish/mileElectrofishing CPUE · p. 9
Bluegill
1,846 fishFyke-net catch · p. 950.9 fish/net-nightFyke-net CPUE · p. 975 fishElectrofishing catch · p. 975 fish/mileElectrofishing CPUE · p. 9
Common carp
1,072 fishFish marked · p. 8543 fishRecapture-run catch · p. 860 fishMarked fish recaptured · p. 89,568 fishPopulation estimate · p. 8
Largemouth bass
32 fishFyke-net catch · p. 90.9 fish/net-nightFyke-net CPUE · p. 933 fishElectrofishing catch · p. 927.3 fish/mileElectrofishing CPUE · p. 9
Walleye
38 fishSpring-netting catch · p. 71.1 fish/net-nightSurvey CPUE · p. 733 fishAdults marked · p. 815 fishRecapture-run catch · p. 8
Yellow perch
43 fishTotal captured · p. 81.2 fish/net-nightSurvey CPUE · p. 85.1 inchesminimum captured length · p. 810.4 inchesmaximum captured length · p. 8
Comprehensive Fishery Survey of Ludden Lake, Iowa County, Wisconsin 2023Matched by exact queue uuid wbic state name county report name no printed wbic · WBICs · verified 2026-07-19Wisconsin DNR fisheries survey report; LakeList operator documented permission to leverage this report with source attribution.
56surface acres
14max depth feet
1public access points
42.8777, -90.1999latitude, longitude
Access
Public access points
Boat launchLudden Lake Access42.87775, -90.20141Managed by TOWNSHIPTOWN OF MINERAL POINTRamp surface: ConcreteADA-accessible feature: NoVerified 2026-07-12
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
Largemouth BassPanfishSmallmouth Bass
Depth FAQ
How deep is Ludden Lake?
Ludden Lake is 14 feet deep at its deepest point and averages about 5 feet, according to Wisconsin DNR records.
Is there a free depth map of Ludden Lake?
Yes. LakeList publishes a free interactive depth contour map of Ludden 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 Ludden 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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