Rosalind Lake
Vilas County, WisconsinView mapDirections
Wisconsin DNR publishes the water-quality measurements for Rosalind Lake. Here is what has been measured.
- Oligotrophic
- 22 ft max depth
Rosalind Lake in Vilas County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 19.3 ft visibility. Phosphorus: 10.5 µg/L.
Rosalind Lake is a cold, clear oligotrophic lake in Vilas County, Wisconsin with an estimated average depth of about 22 feet. Overall water quality is improving over recent sampling years. Compared to the 102 other monitored lakes in Vilas County, Rosalind Lake ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-07-12. Methodology: how these readings are compared.
What Rosalind Lake is good for
From access and monitoring records, not editorial picks.
- Clear water19.3 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 Rosalind 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 Rosalind Lake
These are the measurements Wisconsin DNR publishes for Rosalind 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 19.3 ft down. Phosphorus 10.5 µg/L. TSI 36.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 19.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 10.5µg/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 Rosalind Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Rosalind Lake typically sits around 71°F at the surface in August. Summer average is about 72°F. Usually warmest in Jul (about 78°F) and coldest in Apr (about 48°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (48°F) to its warmest (78°F).
Typical surface water temperature by month, from 15 field readings (2024–2026) via the EPA Water Quality Portal. See the full Rosalind Lake water temperature breakdown →
Lake Details
Max depth
~22 ft est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Wisconsin has not published bathymetry for Rosalind Lake.
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Surface area
30 acres
HydroLAKES / HydroSHEDS
Shoreline
1 mi
HydroLAKES / HydroSHEDS
Elevation
1,634 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 Rosalind Lake
Compare lakeside cabins, hotels, and vacation rentals near Rosalind Lake in Vilas 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 Rosalind 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 Rosalind Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Rosalind Lake
Water Quality Trend: Improving
Based on 7 years of monitoring (2020–2026).
Water clarity
Stable7 years
Phosphorus
Improving-0.28 µg/L/yr7 years
Nearby Lakes in Vilas County
Frequently asked questions about Rosalind Lake
Where is Rosalind Lake?
- Rosalind Lake is a lake in Vilas County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Rosalind Lake?
- Rosalind Lake in Vilas County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 19.3 ft visibility. Phosphorus: 10.5 µg/L.
Is Rosalind 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 Rosalind Lake?
- Rosalind Lake typically sits around 71°F at the surface in August, from 15 EPA Water Quality Portal field readings (2024–2026). That is a typical value for the month, not a live reading.
How deep is Rosalind Lake?
- No published bathymetric survey covers Rosalind Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 22 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Rosalind Lake across LakeQuality
Fish species and the cleanest lakes across Wisconsin
Fish species and best lakes in Vilas County
Species activity outlook by water temperature and season
Top lakes and where to stay in the Northwoods Wisconsin area
Where to stay at Wisconsin's top lakes, each with its readings
Lakes in the Wisconsin River Watershed, ranked by water quality
Wisconsin's cleanest lakes, ranked on agency measurements
More lakes in Wisconsin
Other Lakes in Wisconsin
Oligotrophic Lakes in Wisconsin
Where this data comes from
114 measurements from 2 monitoring stations, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX114 samples · 2020–2026
Analytical methods
- Phosphorus by Colorimetry
- Turbidity in Water
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)