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Long Lake
Enhanced dataInteractive depth contours
Long LakeFond du Lac 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 97% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 47-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 Long Lake.
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Fishing forecast
Best windows for Long 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
Long Lake 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 date unknown
Individual readings are not retained for this lake — the index below is what the monitoring record summarizes.
49 five-year summer trophic state index · Mesotrophic. Moderately clear with moderate nutrients — a typical profile for good swimming lakes.
Long Lake - Deep HoleStation 203077 · TSI based on chlorophyll
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 maps2 converted map sheetsFishing 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
Long Lake depth maps
2 converted map sheets. These historical surveys are not for navigation.
Navigable depth map
Long 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 38700 · 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.
Largemouth bass2026–2027 season · Wisconsin DNRSource verified 2026-07-13Northern pike2026–2027 season · Wisconsin DNRSource verified 2026-07-13
Forecasts describe DNR survey findings and expected opportunities; they are not real-time catch reports or a guarantee of fishing conditions.
423surface acres
47max depth feet
1public access points
43.6714, -88.1713latitude, longitude
Access
Public access points
Boat launchLong Lake Boat Ramp43.66320, -88.16986Managed by STATE(DNR)TOWN OF OSCEOLARamp surface: ConcreteADA-accessible feature: NoVerified 2026-07-12
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
PanfishLargemouth BassNorthern PikeWalleye
Wisconsin DNR stocking
Fish stocking history
The latest published year is 2025, when 3,704 fish were recorded across 1 entry.
2025
WalleyeUnspecified · Large Fingerling
3,7046.0 in average
2024
WalleyeLake Michigan · Large Fingerling
4,5247.0 in average
2022
WalleyeUnspecified · Large Fingerling
4,0006.0 in average
2022
Yellow PerchUnspecified · Large Fingerling
5,0003.0 in average
2020
WalleyeLake Michigan · Large Fingerling
4,2356.9 in average
2019
WalleyeUnspecified · Large Fingerling
5,0006.0 in average
2018
WalleyeMississippi Headwaters · Large Fingerling
4,2337.4 in average
2017
WalleyeLake Michigan · Large Fingerling
4,3408.1 in average
2016
WalleyeUpper Mississippi River · Large Fingerling
4,2237.6 in average
2014
WalleyeLake Michigan · Large Fingerling
4,2337.3 in average
2013
WalleyeUnspecified · Large Fingerling
1,5158.0 in average
2013
WalleyeMississippi Headwaters · Small Fingerling
14,5702.0 in average
Showing the 12 most recent records from 14 published entries.
Depth FAQ
How deep is Long Lake?
Long Lake is 47 feet deep at its deepest point and averages about 22 feet, according to Wisconsin DNR records.
Is there a free depth map of Long Lake?
Yes. LakeList publishes a free interactive depth contour map of Long 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 Long 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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