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Little John Lake
Enhanced dataInteractive depth contours
Little John LakeVilas 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 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 19-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 Little John Lake.
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Fishing forecast
Best windows for Little John 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
Little John 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.
DNR water check
Water quality quick take
Historical volunteer-monitoring record for this lake.
Last sampled Sep 2018Volunteer monitoring 1995–2018
DNR volunteers monitored this lake for about 23 years, ending in 2018. Its final monitored summers showed slight haze water (~7 ft Secchi) in 2018, elevated algae (chlorophyll ~10.5 µg/L) in 2018, and high nutrients (phosphorus ~68 µg/L) in 2004. After 8 years without samples, these readings describe the lake as it was, not as it is.
| Year | Secchi | Chlorophyll-a | Total phosphorus |
|---|---|---|---|
| 2018 | 7.0 ft (3) | 10.5 µg/L (2) | — |
| 2017 | 5.3 ft (3) | 31.0 µg/L (2) | — |
| 2004 | 5.0 ft (1) | 13.0 µg/L (1) | 68.0 µg/L (1) |
| 2000 | — | — | 52.0 µg/L (1) |
| 1998 | 4.3 ft (2) | — | — |
| 1997 | 8.4 ft (2) | — | — |
Little John Lake - Deep HoleStation 643461
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 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
Little John Lake depth maps
1 converted map sheet · 1 map-aligned. These historical surveys are not for navigation.
Navigable depth map
Little John 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 2332300 · map alignment passed · 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.
151surface acres
19max depth feet
1public access points
46.0147, -89.6463latitude, longitude
Access
Public access points
Boat launchLittle John Lake Ramp46.01985, -89.64393Managed by STATE(DNR)TOWN OF BOULDER JUNCTIONRamp surface: Concrete PlankADA-accessible feature: NoVerified 2026-07-12
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
TroutLargemouth BassMuskyWalleyeNorthern PikeSmallmouth Bass
Depth FAQ
How deep is Little John Lake?
Little John Lake is 19 feet deep at its deepest point, according to Wisconsin DNR records.
Is there a free depth map of Little John Lake?
Yes. LakeList publishes a free interactive depth contour map of Little John 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 Little John 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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