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Halfmoon Lake
Enhanced dataInteractive depth contours
Halfmoon LakeEau Claire 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 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 9-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 Halfmoon Lake.
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Fishing forecast
Best windows for Halfmoon 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
Halfmoon Lake water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
77°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.
Wisconsin DNR water assessment
Impaired waterbody listed
The DNR lists this waterbody as impaired. This notice is not itself a closure; review the official assessment and current guidance before your trip.
303(d) / impairment record
EutrophicationPollutants: Total Phosphorus
- Status
- TMDL Approved
- Public health
- General Advice
- Recreation
- Full Body Contact
- Aquatic life
- Not specified
Water is impaired due to one or more pollutants and associated quality impacts.
Review DNR water quality Check consumption advice Source updated 2025-02-10 · 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
Halfmoon Lake depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Halfmoon 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 2125400 · 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.
135surface acres
9max depth feet
1public access points
44.8083, -91.5259latitude, longitude
Access
Public access points
Boat launchAccess44.80607, -91.52696Managed by Wisconsin DNR
DNR verifiedDirections
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
PanfishLargemouth BassNorthern Pike
Wisconsin DNR stocking
Fish stocking history
The latest published year is 2022, when 500 fish were recorded across 1 entry.
2022
Rainbow TroutErwin · Yearling
5008.5 in average
2021
Northern PikeMud Lake - Madison Chain Of Lakes · Large Fingerling
1,4867.7 in average
2019
Northern PikeMud Lake - Madison Chain Of Lakes · Large Fingerling
1,3247.7 in average
2019
Rainbow TroutErwin · Yearling
2019.3 in average
2018
Northern PikeMud Lake - Madison Chain Of Lakes · Large Fingerling
1,3209.5 in average
2018
Rainbow TroutErwin · Yearling
2388.9 in average
2017
Northern PikeMud Lake - Madison Chain Of Lakes · Large Fingerling
1,1889.2 in average
2017
Rainbow TroutErwin · Yearling
2369.7 in average
2016
Northern PikeMud Lake - Madison Chain Of Lakes · Large Fingerling
1,3208.0 in average
2016
Rainbow TroutErwin · Yearling
2369.2 in average
2015
Northern PikeMud Lake - Madison Chain Of Lakes · Large Fingerling
1,0977.5 in average
2015
Rainbow TroutErwin · Yearling
2669.4 in average
Showing the 12 most recent records from 21 published entries.
Depth FAQ
How deep is Halfmoon Lake?
Halfmoon Lake is 9 feet deep at its deepest point and averages about 6 feet, according to Wisconsin DNR records.
Is there a free depth map of Halfmoon Lake?
Yes. LakeList publishes a free interactive depth contour map of Halfmoon 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 Halfmoon 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 Mapsname, coordinates, county, source identifiers
LakeList record updated 2026-07-14
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