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Twin Valley Lake
Enhanced dataInteractive depth contours
Twin Valley LakeIowa 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 80% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 32-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 Twin Valley Lake.
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Fishing forecast
Best windows for Twin Valley 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 Valley 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.
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 recordRecreation restrictions noted
Excess Algal GrowthPollutants: Unknown Pollutant
- Status
- 303d Listed
- Public health
- General 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 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 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 Valley Lake depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Twin Valley 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 1245800 · 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.
Forecasts describe DNR survey findings and expected opportunities; they are not real-time catch reports or a guarantee of fishing conditions.
Wisconsin DNR fisheries survey
Fish population survey
Structured LakeList extraction from the 2018 DNR fisheries survey. Population estimates, density, and catch-rate indices use different units, methods, and scopes, so each value is presented in its original form rather than normalized against a different measure.
Survey indicatorsValues keep their source unit and method; unlike measures are not scaled or compared.
Management contextTwin Valley Lake (WBIC 1245800) only
Human-reviewed 2018-2019 walleye, muskellunge, largemouth-bass and panfish metrics for Twin Valley Lake.
- Historical survey snapshot; not current regulations or navigation guidance.
- Only explicit report observations, estimates and creel metrics were promoted; management targets, lake-class comparisons and unsupported chart-only values were excluded.
- Metric source pages, survey years, methods, units and exact waterbody scope are retained.
Black Crappie
240 fish2018 fyke net catch count · p. 161.8 fish/net-night2018 fyke net cpue · p. 1628 fish2018 electrofishing catch count · p. 1628 fish/mile2018 electrofishing cpue · p. 16
Bluegill
755 fish2018 catch count · p. 15755 fish/mile2018 electrofishing cpue · p. 15540 fish2018 measured count · p. 156.5 inches2018 mean length · p. 15
Green Sunfish
14 fish2018 catch count · p. 165.2 inches2018 mean length · p. 163 inches2018 min length · p. 167.1 inches2018 max length · p. 16
Largemouth Bass
590 fish2018 catch count · p. 13460 fish2018 electrofishing catch count · p. 114,170 adult fish2018 adult population estimate · p. 1430.7 adult fish/acre2018 adult population density · p. 14
Muskellunge
71 fish2018 fyke net catch count · p. 110.5 fish/net-night2018 fyke net cpue · p. 1165 adult fish2018 adult marked count · p. 12168 adult fish2018 adult population estimate · p. 13
Pumpkinseed
123 fish2018 fyke net catch count · p. 160.9 fish/net-night2018 fyke net cpue · p. 1610 fish2018 electrofishing catch count · p. 166.4 inches2018 mean length · p. 16
Walleye
452 fish2018 fyke net catch count · p. 113.3 fish/net-night2018 fyke net cpue · p. 11236 fish2018 electrofishing catch count · p. 1147.2 fish/mile2018 electrofishing cpue · p. 11
Yellow Perch
339 fish2018 catch count · p. 152.5 fish/net-night2018 fyke net cpue · p. 157.2 inches2018 mean length · p. 150.9 inches2018 length sd · p. 15
Comprehensive Fishery Survey of Twin Valley Lake, Iowa County, Wisconsin 2018-2019Matched by exact wbic name county · WBICs 1245800 · verified 2026-07-20Wisconsin DNR fisheries report; LakeList operator documented permission to leverage this public report with source attribution.
136surface acres
32max depth feet
1public access points
43.0235, -90.0924latitude, longitude
Access
Public access points
Boat launchLaunch43.03196, -90.08694Managed by Wisconsin DNR
DNR verifiedDirections
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
Largemouth BassMuskyPanfishTroutWalleye
Depth FAQ
How deep is Twin Valley Lake?
Twin Valley Lake is 32 feet deep at its deepest point and averages about 11 feet, according to Wisconsin DNR records.
Is there a free depth map of Twin Valley Lake?
Yes. LakeList publishes a free interactive depth contour map of Twin Valley 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 Valley 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 2026-05-25
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