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Fenner Lake
Enhanced dataHistorical depth chart
Fenner LakeAdams County, WI
Historical source depth chart available1 converted source DNR map sheet can be panned and zoomed in the browser. Interactive contours stay hidden until visual QA passes. Historical survey — not for navigation.
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Fishing forecast
Best windows for Fenner 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
Fenner Lake water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
75°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
From Wisconsin DNR / Citizen Lake Monitoring readings at Fenner Lake - Max Depth.
Last sampled Jul 2024
Through 2024, clear, low-algae water — summer clarity of 12 ft is clearer than most monitored Wisconsin lakes.
Based on July–August 2023 averages across 4 volunteer readings.43Mesotrophic5-yr summer TSI
Moderately clear with moderate nutrients — a typical profile for good swimming lakes.
Water claritySecchi disk depth
12 ftJul–Aug 2023 avg (2 readings)
ClearStable since 2006
Clearer than 69% of 597 monitored Wisconsin lakes with current readings.
AlgaeChlorophyll-a
4.5 µg/LJul–Aug 2023 avg (2 readings)
LowWorsening — up ~35% vs earlier years
No recent nutrient readings — last measured 2010.
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 |
|---|---|---|---|
| 2024 | 12.0 ft (1) | 5.0 µg/L (1) | — |
| 2023 | 12.0 ft (2) | 4.5 µg/L (2) | — |
| 2022 | 11.8 ft (2) | 4.0 µg/L (2) | — |
| 2021 | 13.0 ft (2) | 3.0 µg/L (2) | — |
| 2019 | 10.5 ft (1) | 4.0 µg/L (1) | — |
| 2016 | — | 3.0 µg/L (1) | 46.0 µg/L (1) |
| 2011 | — | 2.0 µg/L (1) | 120.0 µg/L (1) |
| 2010 | 12.8 ft (2) | 6.5 µg/L (2) | 15.0 µg/L (2) |
| 2008 | 10.0 ft (1) | 4.0 µg/L (1) | 14.0 µg/L (1) |
| 2006 | 9.0 ft (2) | — | — |
Latest individual samples: Secchi 12 ft (2024-07-24), chlorophyll-a 5 µg/L (2024-07-24), and total phosphorus 21 µg/L (2021-06-24).
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.
Fenner Lake - Max DepthStation 013008 · 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 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
Fenner Lake depth maps
1 converted map sheet · 1 map-aligned. These historical surveys are not for navigation.
Navigable depth map
Fenner 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 103400 · map alignment passed · 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.
Wisconsin DNR · 2026–2027 season
Lake-specific fishing regulations
Rule text published by the DNR for this waterbody, cached by WBIC and verified 2026-07-12.
All species
This lake may be in more than 1 county. Follow the trolling regulations for the county in which you are fishing. A list of counties and waters that allow motor trolling with 3 hooks, baits, or lures per angler can be found at http://dnr.wi.gov/topic/fishing/questions/troll.html. All other waters allow motor trolling with 1 hook, bait or lure per angler, and no more than 2 hooks, baits, or lures per boat.
Catfish
Season Dates: Open All Year. See specific species regulations in this group.
Cisco and whitefish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is 10.
Lake sturgeon
Season Dates: Closed. No fishing allowed.
Largemouth and smallmouth bass
Season Dates: May 2, 2026 to March 7, 2027. The minimum length limit is 14" and the daily bag limit is 5.
Muskellunge and hybrids
Season Dates: May 2, 2026 to December 31, 2026 on open water. The minimum length limit is 40" and the daily bag limit is 1.
Northern pike
Season Dates: May 2, 2026 to March 7, 2027. The minimum length limit is 26" and the daily bag limit is 2.
Paddlefish
Season Dates: Closed. No fishing allowed.
Panfish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is 25.
Rock, yellow, and white bass
Season Dates: Open All Year. No minimum length limit and the daily bag limit is unlimited.
Rough fish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is unlimited.
Shovelnose sturgeon
Season Dates: Closed. No fishing allowed.
Trout and salmon
See Trout regulations layer.
Urban waters gamefish
This waterbody is not considered an urban water, Urban Waters Gamefish regulations do not apply.
Walleye, sauger, and hybrids
Season Dates: May 2, 2026 to March 7, 2027. The minimum length limit is 15" and the daily bag limit is 3.
Regulations can change. The official DNR page controls; verify seasons, boundaries, bag limits, and emergency rules before fishing.
41surface acres
18max depth feet
1public access points
43.8639, -89.5983latitude, longitude
Access
Public access points
Boat launchAccess43.86187, -89.59515Managed by Wisconsin DNR
DNR verifiedDirections
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
PanfishLargemouth BassNorthern Pike
Depth FAQ
How deep is Fenner Lake?
Fenner Lake is 18 feet deep at its deepest point and averages about 5 feet, according to Wisconsin DNR records.
Is there a free depth map of Fenner Lake?
Yes. 1 scanned Wisconsin DNR lake survey map sheet is free to view and zoom on LakeList. These historical surveys are not for navigation.
Where does the Fenner Lake depth map come from?
The map sheets are converted from official Wisconsin DNR lake survey documents, with the source URL, checksum, and retrieval date retained for every sheet. Historical surveys are 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