Mauthe Lake
Fond du Lac County, Wisconsin70 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Mauthe Lake. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
- 2 aquatic invasives
- 23 ft max depth
- Public access
- Limited data
Mauthe Lake in Fond du Lac County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 6 ft visibility. Phosphorus: 54 µg/L. Maximum depth: 23 ft. Surface area: 70 acres.
Wisconsin DNR lists Panfish as common on Mauthe Lake. DNR survey details →
Mauthe Lake is a 70-acre productive, nutrient-rich eutrophic lake in Fond du Lac County, Wisconsin with a maximum depth of 23 feet. Overall water quality is improving over recent sampling years. The lake supports 4 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 1 public boat landing. Compared to the 8 other monitored lakes in Fond du Lac County, Mauthe Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2020-09-10. Methodology: how these readings are compared.
Mauthe Lake covers about 70 acres in Fond du Lac County. It has one public boat landing. For a place on the water, look through cabin and lake-house rentals near Mauthe Lake on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
What Mauthe Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing4 species recorded
Swimming conditions
Readings onlyRecreation use not supported
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.
Based on E. coli testing, Mauthe Lake rarely exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 1.8% of 110 samples across 9 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Wisconsin’s current beach and health-department advisories before swimming.
Whether Mauthe 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.
Water quality measurements for Mauthe Lake
These are the measurements Wisconsin DNR publishes for Mauthe Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 6 ft. Phosphorus 54 µg/L. TSI 56.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 54µg/L | Fair 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. | 56 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Mauthe Lake
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Panfish as common on Mauthe Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Mauthe Lake’s water-quality measurements separately, and the water-quality trend over 7 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 2020).
Fish Species (DNR-rated)
Lake Details
Max depth
23 ft
Surface area
70 acres
Public access
Yes
Listed by Wisconsin DNR
Lake Size & Watershed
Watershed (drainage) area
43 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.2 mi
HydroLAKES / HydroSHEDS
Elevation
965 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Mauthe 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 Mauthe Lake
Compare lakeside cabins, hotels, and vacation rentals near Mauthe Lake in Fond du Lac 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 Mauthe Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
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Fish Species
Click a species to see every lake where it is documented.
Fishing Mauthe 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.
Water Quality Trend: Improving
Based on 7 years of monitoring (2020–2026).
Water clarity
Stable6 years
Phosphorus
Improving-2.29 µg/L/yr7 years
EPA Impairment Status
Mauthe Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption, Recreation.
Source: EPA ATTAINS assessment unit WI10001196 · Official waterbody report
Nearby Lakes in Fond du Lac County
Frequently asked questions about Mauthe Lake
Where is Mauthe Lake?
- Mauthe Lake is a lake in Fond du Lac County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Mauthe Lake?
- Mauthe Lake in Fond du Lac County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 6 ft visibility. Phosphorus: 54 µg/L. Maximum depth: 23 ft. Surface area: 70 acres.
Is Mauthe Lake safe to swim in?
- Based on E. coli testing, Mauthe Lake rarely exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 1.8% of 110 samples across 9 seasons. That is a historical summary of past bacteria testing, not a current reading and not a swimming clearance. Bacteria levels can spike quickly after heavy rain, so whether Mauthe Lake is safe to swim in today is a call for Wisconsin's water agency and the county health department; check their current beach advisories before you swim.
How deep is Mauthe Lake?
- Mauthe Lake has a maximum depth of 23 feet. The lake covers 70 acres.
What fish are in Mauthe Lake?
- Fish species found in Mauthe Lake include Panfish, Largemouth Bass, Northern Pike, Walleye. Mauthe Lake is located in Fond du Lac County, Wisconsin.
What did the DNR fisheries survey find at Mauthe Lake?
- Wisconsin DNR lists Panfish as common on Mauthe Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Mauthe Lake’s water-quality measurements separately, and the water-quality trend over 7 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Mauthe Lake?
- Mauthe Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Mauthe Lake. Public access is listed as yes.
Can I fish at Mauthe Lake?
- Mauthe 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 Mauthe Lake across LakeQuality
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Where this data comes from
6 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX6 samples · 2020
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (1)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory