Lake Dorothy
Iron County, Wisconsin21 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Lake Dorothy. Here is what has been measured.
- 26 ft max depth
- Limited data
Lake Dorothy in Iron County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 7.9 ft visibility. Phosphorus: 16.9 µg/L. Maximum depth: 26 ft. Surface area: 21 acres.
Wisconsin DNR lists Largemouth Bass as common on Lake Dorothy. DNR survey details →
Lake Dorothy is a 21-acre lake in Iron County, Wisconsin with a maximum depth of 26 feet. The lake supports 3 documented fish species including Musky, Panfish, and Largemouth Bass.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2022-08-31. Methodology: how these readings are compared.
What Lake Dorothy is good for
From access and monitoring records, not editorial picks.
- Fishing3 species recorded
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lake Dorothy 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 Lake Dorothy
These are the measurements Wisconsin DNR publishes for Lake Dorothy, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 7.9 ft. Phosphorus 16.9 µg/L. TSI 46.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 7.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 16.9µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| 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. | 46 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Lake Dorothy
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Largemouth Bass as common on Lake Dorothy.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lake Dorothy’s water-quality measurements separately. 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 2022).
Fish Species (DNR-rated)
Lake Details
Max depth
26 ft
Surface area
21 acres
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Stays near Lake Dorothy
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Fish Species
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Fishing Lake Dorothy
Nearby Lakes in Iron County
Frequently asked questions about Lake Dorothy
Where is Lake Dorothy?
- Lake Dorothy is a lake in Iron County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Lake Dorothy?
- Lake Dorothy in Iron County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 7.9 ft visibility. Phosphorus: 16.9 µg/L. Maximum depth: 26 ft. Surface area: 21 acres.
Is Lake Dorothy safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Lake Dorothy?
- Lake Dorothy has a maximum depth of 26 feet. The lake covers 21 acres.
What fish are in Lake Dorothy?
- Fish species found in Lake Dorothy include Musky, Panfish, Largemouth Bass. Lake Dorothy is located in Iron County, Wisconsin.
What did the DNR fisheries survey find at Lake Dorothy?
- Wisconsin DNR lists Largemouth Bass as common on Lake Dorothy. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lake Dorothy’s water-quality measurements separately. Catch rate is not a swim clearance and is not a weekly bite report.
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Where this data comes from
3 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX3 samples · 2022
Analytical methods
- Phosphorus by Colorimetry
- Turbidity in Water
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
Fish and recreation data from Wisconsin DNR Lakes