Woman Lake
Woman Lake in Cass County, Minnesota has a water quality grade of A (Excellent). Water clarity: 15 ft visibility. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 3.2 µg/L.
- Clarity
- 15 ft
- Mean depth
- ~28 ft est.
- Type
- Oligotrophic
- Public access
- Yes
Next lake in Cass County
Woman Lake is a cold, clear oligotrophic lake in Cass County, Minnesota with an estimated average depth of about 28 feet. Water quality is graded A based on 2 sampling years through 2025. Limited fish-species data available. Public access is available. Compared to the 103 other monitored lakes in Cass County, Woman Lake ranks #10 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-29. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
Crystal clear, you can see 15 ft down. Phosphorus level: 11 µg/L. Chlorophyll-a: 3.2 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 15 ft | Not graded |
| Phosphorus | 11 µg/L | Good |
| Chlorophyll-a (Algae) | 3.2 µg/L | Good |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Woman Lake
Compare lakeside cabins, hotels, and vacation rentals near Woman Lake in Cass County, Minnesota — 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.
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Blue-Green Algae (Cyanobacteria)
There’s no recent EPA CyAN cyanobacteria estimate for Woman Lake — clouds, ice, or an off-season gap in coverage. The most recent reading was moderate (29,648 cells/mL) on November 22, 2025.
Blue-green algae can appear and clear within days, so check your state’s current advisory before swimming. EPA CyAN ↗
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~28 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Minnesota has not published bathymetry for Woman Lake.
Lake Size & Watershed
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.
Fishing Woman 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.
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Woman Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Public Water Access Sites — Woman (main lake)Public Water Access Sites · MN DNR LakeFinder
County Ranking
Ranked #10 of 104 lakes in Cass County
Nearby Lakes in Cass County
Frequently asked questions about Woman Lake
What is the water quality grade for Woman Lake?
- Woman Lake in Cass County, Minnesota has a water quality grade of A (Excellent). Water clarity: 15 ft visibility. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 3.2 µg/L.
Is Woman Lake safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Woman Lake has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 3.2 µg/L. Always check local health department advisories before swimming.
How deep is Woman Lake?
- No published bathymetric survey covers Woman Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 28 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Does Woman Lake have blue-green algae?
- There is no recent EPA CyAN cyanobacteria estimate for Woman Lake (clouds, ice, or an off-season gap). The most recent reading was moderate (29,648 cells/mL). Blue-green algae can appear and clear within days, so check Minnesota's current advisory before swimming.
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Where this data comes from
143 measurements from 7 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA143 samples · 2020–2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
Monitoring station identifiers (7)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder