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Twin Island Lake
Enhanced dataInteractive depth contours
Twin Island LakeVilas County, WI
Contours load with map
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 93% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 15-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 Twin Island Lake.
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Fishing forecast
Best windows for Twin Island 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
Twin Island Lake water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
76°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
Historical volunteer-monitoring record for this lake.
Last sampled Aug 2018Volunteer monitoring 1984–2018
DNR volunteers monitored this lake for about 34 years, ending in 2018. Its final monitored summers showed slight haze water (~6.1 ft Secchi) in 2018, elevated algae (chlorophyll ~19 µg/L) in 2007, and low nutrients (phosphorus ~16 µg/L) in 2007. After 8 years without samples, these readings describe the lake as it was, not as it is.
| Year | Secchi | Chlorophyll-a | Total phosphorus |
|---|---|---|---|
| 2018 | 6.1 ft (2) | — | — |
| 2007 | — | 19.0 µg/L (1) | 16.0 µg/L (1) |
| 2003 | 5.0 ft (1) | — | — |
| 1984 | 3.0 ft (1) | 42.0 µg/L (1) | — |
Twin Island Lake - Deep HoleStation 643266
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
Twin Island Lake depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Twin Island 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 2959300 · 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.
203surface acres
15max depth feet
0public access points
46.2247, -89.5933latitude, longitude
Access
Public access points
No mapped access points yet
LakeList has not matched a public launch, park, or shoreline access point for this lake yet.
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
PanfishLargemouth BassMuskyNorthern PikeWalleye
Wisconsin DNR stocking
Fish stocking history
The latest published year is 2025, when 90 fish were recorded across 1 entry.
2025
MuskellungeUpper Chippewa River · Large Fingerling
9010.0 in average
2024
WalleyeMississippi Headwaters · Large Fingerling
5386.0 in average
2023
MuskellungeUpper Chippewa River · Large Fingerling
5010.0 in average
2023
WalleyeUpper Wisconsin River · Large Fingerling
2506.0 in average
2022
WalleyeMississippi Headwaters · Large Fingerling
7256.0 in average
2021
WalleyeMississippi Headwaters · Large Fingerling
1,7506.0 in average
2021
Yellow PerchUnspecified · Large Fingerling
1005.0 in average
2020
MuskellungeUpper Wisconsin River · Large Fingerling
1312.0 in average
2020
WalleyeMississippi Headwaters · Large Fingerling
1,3005.0 in average
2019
MuskellungeUpper Wisconsin River · Large Fingerling
4012.0 in average
2019
WalleyeMississippi Headwaters · Large Fingerling
1,1005.0 in average
2018
MuskellungeUpper Wisconsin River · Yearling
1812.0 in average
Showing the 12 most recent records from 22 published entries.
Depth FAQ
How deep is Twin Island Lake?
Twin Island Lake is 15 feet deep at its deepest point and averages about 8 feet, according to Wisconsin DNR records.
Is there a free depth map of Twin Island Lake?
Yes. LakeList publishes a free interactive depth contour map of Twin Island 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 Twin Island 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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