Mildred Lake
Oneida County, Wisconsin168 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Mildred Lake. Here is what has been measured.
- Oligotrophic
- 45 ft max depth
- Public access
Mildred Lake in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 18 ft visibility. Phosphorus: 12.3 µg/L. Maximum depth: 45 ft. Surface area: 168 acres.
Wisconsin DNR lists Largemouth Bass as common on Mildred Lake. DNR survey details →
Mildred Lake is a 168-acre cold, clear oligotrophic lake in Oneida County, Wisconsin with a maximum depth of 45 feet. Overall water quality is declining over recent sampling years. The lake supports 4 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 1 public boat landing. Compared to the 66 other monitored lakes in Oneida County, Mildred Lake ranks #20 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-29. Methodology: how these readings are compared.
What Mildred Lake is good for
From access and monitoring records, not editorial picks.
- Clear water18 ft of visibility
- Boat launch1 documented ramp
- Fishing4 species recorded
- Deep water45 ft surveyed max depth
Swimming conditions
Readings onlyLow 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 Mildred 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 Mildred Lake
These are the measurements Wisconsin DNR publishes for Mildred Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 18 ft down. Phosphorus 12.3 µg/L. TSI 38.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 18ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 12.3µg/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. | 38 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Mildred Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Mildred Lake typically sits around 71°F at the surface in August. Summer average is about 73°F. Usually warmest in Jul (about 75°F) and coldest in Aug (about 71°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (71°F) to its warmest (75°F).
Typical surface water temperature by month, from 9 field readings (2024–2025) via the EPA Water Quality Portal. See the full Mildred Lake water temperature breakdown →
Wisconsin DNR lists Largemouth Bass as common on Mildred Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Mildred Lake’s water-quality measurements separately, and the water-quality trend over 7 years of monitoring is declining. 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. Monitored by volunteers since 1992. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
Max depth
45 ft
Surface area
168 acres
Public access
Yes
Listed by Wisconsin DNR
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Shoreline
3.9 mi
HydroLAKES / HydroSHEDS
Elevation
1,588 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Mildred LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Stays near Mildred Lake
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Fish Species
Click a species to see every lake where it is documented.
Fishing Mildred 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: Worsening
Based on 7 years of monitoring (2020–2026).
Water clarity
Worsening7 years
Phosphorus
Worsening+0.43 µg/L/yr7 years
Nearby Lakes in Oneida County
Frequently asked questions about Mildred Lake
Where is Mildred Lake?
- Mildred Lake is a lake in Oneida County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Mildred Lake?
- Mildred Lake in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 18 ft visibility. Phosphorus: 12.3 µg/L. Maximum depth: 45 ft. Surface area: 168 acres.
Is Mildred Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Mildred Lake?
- Mildred Lake typically sits around 71°F at the surface in August, from 9 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is Mildred Lake?
- Mildred Lake has a maximum depth of 45 feet. The lake covers 168 acres.
What fish are in Mildred Lake?
- Fish species found in Mildred Lake include Musky, Panfish, Largemouth Bass, Walleye. Mildred Lake is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Mildred Lake?
- Wisconsin DNR lists Largemouth Bass as common on Mildred Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Mildred Lake’s water-quality measurements separately, and the water-quality trend over 7 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Mildred Lake?
- Mildred Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Mildred Lake. Public access is listed as yes.
Can I fish at Mildred Lake?
- Mildred 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 Mildred Lake across LakeQuality
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Where this data comes from
34 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX34 samples · 2020–2026
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
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