2025
MuskellungeUpper Chippewa River · Large Fingerling
2,46212.7 in average
LakeList
FavoritesStateWisconsin
Turtle-Flambeau Flowage
Enhanced dataInteractive depth contours
Turtle-Flambeau FlowageIron 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 34% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 50-ft maximum depth. More accurate than a pure model, but still an estimate. Not for navigation.LakeList assistant
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Fishing spots, food, lodging, marinas, and rentals around Turtle-Flambeau Flowage.
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Fishing
Fishing at Turtle-Flambeau Flowage
Fishery
Notable species
Northern PikeWalleyeMuskyPanfishSmallmouth BassLargemouth BassSturgeon
Angler reports · Fishbrain
What anglers catch here
Anglers have logged 192 catches on Turtle-Flambeau Flowage via Fishbrain — 2 in the last 30 days, most recently on Jul 24, 2026.
Most-reported species
- Smallmouth bass
- Northern pike
- Walleye
- Muskellunge
- Black crappie
- Bluegill
Show 3 more species
- Largemouth bass
- Yellow perch
- Rock bass
9 of the 192 logged catches didn’t name a species and aren’t listed above.
Seasonality
All fishOf the 192 logged catches, 156 carry a month and 131 carry a year; the charts cover those.
2024 had the most reports (31).
Counts reflect reporting activity, not fish populations. Waterbody location is provider-level; exact spots and angler details aren’t shown.
Fishery details for this lakeExplore this area on FishbrainWisconsin DNR stocking
Fish stocking history
The latest published year is 2025, when 2,462 fish were recorded across 1 entry.
2023
MuskellungeUpper Chippewa River · Large Fingerling
2,50011.7 in average
2021
MuskellungeUpper Chippewa River · Large Fingerling
96113.9 in average
2019
MuskellungeUpper Chippewa River · Large Fingerling
1,39112.9 in average
2015
Lake SturgeonFlambeau River · Large Fingerling
1,7409.9 in average
2015
MuskellungeUpper Chippewa River · Large Fingerling
2,49412.2 in average
2012
MuskellungeUpper Chippewa River · Large Fingerling
2,90813.4 in average
2010
MuskellungeUpper Wisconsin River · Large Fingerling
75513.2 in average
2010
MuskellungeUpper Chippewa River · Large Fingerling
34212.7 in average
NWS weather
Weather windows
Weather-based planning from the National Weather Service hourly forecast near this lake — not a catch forecast.
Loading latest forecast…
Checking wind, precipitation, and near-term weather windows.
Water temperature
Turtle-Flambeau Flowage water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
68°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.
Wisconsin DNR water assessment
Public-health advice and impairment listed
The DNR assessment indicates specific public-health advice for this waterbody. Review current official guidance before your trip or eating your catch.
303(d) / impairment recordSpecific public-health adviceRecreation restrictions noted
Mercury Contaminated Fish Tissue, Excess Algal Growth, EutrophicationPollutants: Mercury, Total Phosphorus
- Status
- 303d Listed
- Public health
- Specific Advice
- Recreation
- Recreational Restrictions
- 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 2026-03-25 · LakeList verified 2026-07-12
DNR water check
Water quality quick take
From Wisconsin DNR / Citizen Lake Monitoring readings at Turtle Flambeau Flowage - Near Murrays Landing.
Sampled Aug 2025Volunteer monitoring since 1998
Somewhat hazy but low-algae water — summer clarity of 5.5 ft is lower than most monitored Wisconsin lakes.
Based on July–August 2025 averages across 4 volunteer readings.50Mesotrophic5-yr summer TSI
Moderately clear with moderate nutrients — some algae and plant growth through the season.
Water claritySecchi disk depth
5.5 ftJul–Aug 2025 avg (2 readings)
HazyImproving — up ~26% vs earlier years
Clearer than 27% of 593 monitored Wisconsin lakes with current readings.
AlgaeChlorophyll-a
3 µg/LJul–Aug 2025 avg (2 readings)
LowStable since 2016
NutrientsTotal phosphorus — fuels plant & algae growth
209 µg/LLatest single sample · 2025-05-02
HighHigh 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 |
|---|---|---|---|
| 2025 | 5.5 ft (2) | 3.0 µg/L (2) | — |
| 2024 | 7.0 ft (1) | 1.0 µg/L (1) | — |
| 2023 | 8.3 ft (2) | 1.5 µg/L (2) | — |
| 2022 | 7.5 ft (2) | 2.0 µg/L (2) | — |
| 2021 | 4.5 ft (2) | 2.0 µg/L (2) | — |
| 2020 | 4.5 ft (2) | — | — |
| 2019 | 6.2 ft (3) | 2.3 µg/L (3) | — |
| 2018 | 5.0 ft (1) | — | — |
| 2017 | 4.9 ft (2) | 2.0 µg/L (2) | — |
| 2016 | 4.3 ft (3) | 1.7 µg/L (3) | — |
Latest individual samples: Secchi 6 ft (2025-08-25), chlorophyll-a 2 µg/L (2025-08-25), and total phosphorus 209 µg/L (2025-05-02).
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.
Turtle Flambeau Flowage - Near Murrays LandingStation 10019764 · TSI based on chlorophyll
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 maps19 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
Turtle-Flambeau Flowage depth maps
19 converted map sheets. These historical surveys are not for navigation.
Navigable depth map
Turtle Flambeau Flowage · 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 2294900 · 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.
12,942surface acres
50max depth feet
5public access points
46.0718, -90.1378latitude, longitude
Access
Public access points
Boat launchFishermans Landing46.09188, -90.16991Managed by STATE(DNR)TOWN OF MERCERRamp surface: ConcreteADA-accessible feature: YesVerified 2026-07-12
Boat launchMurrays Landing46.08192, -90.07989Managed by STATE(DNR)TOWN OF SHERMANRamp surface: GrateADA-accessible feature: NoVerified 2026-07-12
Boat launchSportsmans Landing46.07397, -90.23915Managed by STATE(DNR)TOWN OF MERCERRamp surface: ConcreteADA-accessible feature: YesVerified 2026-07-12
Boat launchSpringstead Landing46.07335, -90.17386Managed by STATE(DNR)TOWN OF SHERMANRamp surface: ConcreteADA-accessible feature: YesVerified 2026-07-12
Boat launchSturgeon Bay Landing46.12364, -90.18496Managed by STATE(DNR)TOWN OF MERCERRamp surface: GravelADA-accessible feature: NoVerified 2026-07-12
Nearby
Trip-planning places
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Depth FAQ
How deep is Turtle-Flambeau Flowage?
Turtle-Flambeau Flowage is 50 feet deep at its deepest point, according to Wisconsin DNR records.
Is there a free depth map of Turtle-Flambeau Flowage?
Yes. LakeList publishes a free interactive depth contour map of Turtle-Flambeau Flowage 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 Turtle-Flambeau Flowage 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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