Two Sisters Lake
Oneida County, WisconsinView mapDirections
Wisconsin DNR publishes the water-quality measurements for Two Sisters Lake. Here is what has been measured.
- Oligotrophic
- 51 ft max depth
- Public access
Two Sisters Lake in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 19.6 ft visibility. Phosphorus: 10.8 µg/L.
Two Sisters Lake is a cold, clear oligotrophic lake in Oneida County, Wisconsin with an estimated average depth of about 51 feet. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 66 other monitored lakes in Oneida County, Two Sisters Lake ranks #33 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-08-29. Methodology: how these readings are compared.
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What Two Sisters Lake is good for
From access and monitoring records, not editorial picks.
- Clear water19.6 ft of visibility
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 Two Sisters 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 Two Sisters Lake
These are the measurements Wisconsin DNR publishes for Two Sisters 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 19.6 ft down. Phosphorus 10.8 µg/L. TSI 36.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 19.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 10.8µg/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. | 36 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Two Sisters Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Two Sisters Lake typically sits around 70°F at the surface in August. Summer average is about 71°F. Usually warmest in Jul (about 74°F) and coldest in May (about 53°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (53°F) to its warmest (74°F).
Typical surface water temperature by month, from 24 field readings (2024–2025) via the EPA Water Quality Portal. See the full Two Sisters Lake water temperature breakdown →
Lake Details
Max depth
~51 ft est.
Public access
Yes
Listed by Wisconsin DNR
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Wisconsin has not published bathymetry for Two Sisters Lake.
Lake Size & Watershed
Watershed (drainage) area
6 sq mi
HydroLAKES / HydroSHEDS
Surface area
667 acres
HydroLAKES / HydroSHEDS
Shoreline
8 mi
HydroLAKES / HydroSHEDS
Elevation
1,575 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Stays via Stay22
Stays near Two Sisters Lake
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Top-rated places to stay near Two Sisters Lake
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Follow Two Sisters Lake’s readings
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Fishing Two Sisters Lake
Water Quality Trend: Worsening
Based on 6 years of monitoring (2020–2025).
Water clarity
Stable6 years
Phosphorus
Worsening+1.81 µg/L/yr5 years
Nearby Lakes in Oneida County
Frequently asked questions about Two Sisters Lake
Where is Two Sisters Lake?
- Two Sisters 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 Two Sisters Lake?
- Two Sisters Lake in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 19.6 ft visibility. Phosphorus: 10.8 µg/L.
Is Two Sisters 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 Two Sisters Lake?
- Two Sisters Lake typically sits around 70°F at the surface in August, from 24 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is Two Sisters Lake?
- No published bathymetric survey covers Two Sisters Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 51 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Can I fish at Two Sisters Lake?
- Public access to Two Sisters Lake is listed as yes on the lake record. 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 Two Sisters Lake across LakeQuality
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Where this data comes from
58 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX58 samples · 2020–2025
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (2)
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)