Where is Fenner Lake?

Fenner Lake is a lake in Marquette County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.

How deep is Fenner Lake?

Fenner Lake has a maximum depth of 18 feet. The lake covers 41 acres.

What fish are in Fenner Lake?

Fish species found in Fenner Lake include Panfish, Largemouth Bass, Northern Pike. Fenner Lake is located in Marquette County, Wisconsin.

Are there boat ramps on Fenner Lake?

Fenner Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Fenner Lake. Public access is listed as yes.

Can I fish at Fenner Lake?

Fenner Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.

Fenner Lake

Marquette County, Wisconsin41 acresView map Directions

Wisconsin DNR publishes the water-quality measurements for Fenner Lake. Here is what has been measured.

Clarity

12 ft

Typical for Wisconsin

Secchi · sampled 2024

Phosphorus

16.8 µg/L

Typical for Wisconsin

Measured by Wisconsin DNR

Max depth

18 ft

Bathymetric survey

Area

41 acres

Surface area

Type

Mesotrophic

Trophic class

Trend

Improving

4 years of samples

Mesotrophic
Curly-Leaf Pondweed
18 ft max depth
Public access

See the measurements Directions Where to stay

Fenner Lake in Marquette County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 12 ft visibility. Phosphorus: 16.8 µg/L. Maximum depth: 18 ft. Surface area: 41 acres.

Wisconsin DNR lists Panfish as common on Fenner Lake. DNR survey details →

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Fenner Lake is a 41-acre mesotrophic lake in Marquette County, Wisconsin with a maximum depth of 18 feet. Overall water quality is improving over recent sampling years. The lake supports 3 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 1 public boat landing. Compared to the 10 other monitored lakes in Marquette County, Fenner Lake ranks #7 for water quality.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-07-24. Methodology: how these readings are compared.

Fenner Lake covers about 41 acres in Marquette County. It has one public boat landing. Vrbo is where to look for cabins and lake homes around Fenner Lake, and Booking.com and Expedia search hotels near the lake for your dates.

What Fenner Lake is good for

From access and monitoring records, not editorial picks.

Clear water12 ft of visibility
Boat launch1 documented ramp
Fishing3 species recorded

Swimming conditions

Readings only

Low algae

Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Fenner Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Compare swimming lakes near Wisconsin Dells →

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Water quality measurements for Fenner Lake

These are the measurements Wisconsin DNR publishes for Fenner Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

Good clarity, visible to about 12 ft. Phosphorus 16.8 µg/L. TSI 43.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	12ft	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	16.8µg/L	Good GoodFairPoor
Chlorophyll-a (algae)		No reading The green pigment in algae — a direct measure of how much algae is in the water.
Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a.	43	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Fenner Lake

Answers come straight from the public measurements and survey records on this page.

DNR fisheries survey

Wisconsin DNR lists Panfish as common on Fenner Lake.

A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Fenner Lake’s water-quality measurements separately, and the water-quality trend over 4 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2024).

DNR Assessment

Good · Deep Seepage lake

Trophic State Index 43 (mesotrophic) · 5-year average

Fish Species (DNR-rated)

Panfish(Common)Largemouth Bass(Present)Northern Pike(Present)

Contour map (PDF) →Full WI DNR LakePage →Water quality stations →

Lake Details

Max depth

18 ft

Surface area

41 acres

Public access

Yes

Listed by Wisconsin DNR

Lake Size & Watershed

Watershed (drainage) area

3 sq mi

HydroLAKES / HydroSHEDS

Shoreline

1 mi

HydroLAKES / HydroSHEDS

Elevation

948 ft

Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).

Recreation & Access

Boat Landings

Yes

Public Access

Fenner LakePublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

Stays via Stay22

Stays near Fenner Lake

Compare lakeside cabins, hotels, and vacation rentals near Fenner Lake in Marquette County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Fenner Lake

Prices for Oct 16–18, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Planning a whole trip? See where to stay at Wisconsin’s top lakes →

Follow Fenner Lake’s readings

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Fish Species

Panfish Largemouth Bass Northern Pike

Click a species to see every lake where it is documented.

Fishing Fenner Lake

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

Banded Mystery SnailChinese Mystery SnailCurly-Leaf PondweedEurasian Water-Milfoil

Water Quality Trend: Improving

Based on 4 years of monitoring (2021–2024).

Water clarity
Improving
4 years
Phosphorus
Improving
-0.75 µg/L/yr4 years

See year-by-year chart →

Regulated Pollution Sources Nearby

1 EPA-permitted facility operate within about 5 miles of Fenner Lake under Clean Water Act (NPDES) discharge permits.

Slowey Farms Llc
Westfield, Town Of · 2.8 mi away · NPDES WI0061913

Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.

Nearby Lakes in Marquette County

Mud Lake—View →Lawrence Lake6.7 ft clear · Eutrophic—View →East Twin Lake3.3 ft clear · Eutrophic—View →West Twin Lake4.9 ft clear · Eutrophic—View →Emrick Lake—View →Pine Lake—View →

Frequently asked questions about Fenner Lake

Where is Fenner Lake?: Fenner Lake is a lake in Marquette County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Fenner Lake?: Fenner Lake in Marquette County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 12 ft visibility. Phosphorus: 16.8 µg/L. Maximum depth: 18 ft. Surface area: 41 acres.
Is Fenner Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Fenner Lake?: Fenner Lake has a maximum depth of 18 feet. The lake covers 41 acres.
What fish are in Fenner Lake?: Fish species found in Fenner Lake include Panfish, Largemouth Bass, Northern Pike. Fenner Lake is located in Marquette County, Wisconsin.
What did the DNR fisheries survey find at Fenner Lake?: Wisconsin DNR lists Panfish as common on Fenner Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Fenner Lake’s water-quality measurements separately, and the water-quality trend over 4 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Fenner Lake?: Fenner Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Fenner Lake. Public access is listed as yes.
Can I fish at Fenner Lake?: Fenner Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.

Explore Fenner Lake across LakeQuality

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State Parks Near Fenner Lake

Roche-a-Cri State Park

State Park · 14.6 mi

Rocky Arbor State Park

State Park · 18.5 mi

Buckhorn State Park

State Park · 20.9 mi

Mirror Lake State Park

State Park · 23.5 mi

Other Lakes in Wisconsin

Adams County · 7 ft

Adams County · 5 ft

Adams County · 15 ft

Adams County · 8 ft

Adams County · 9 ft

Adams County · 17 ft

Mesotrophic Lakes in Wisconsin

Mcginnis Lake Goose Lake Peppermill Lake Crooked Lake

Where this data comes from

30 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.

Collected and reported by

Wisconsin Department of Natural ResourcesWIDNR_WQX30 samples · 2021–2024

Analytical methods

Phosphorus by Colorimetry

Monitoring station identifiers (1)

WIDNR_WQX-013008

EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.