Lake Mary
Iron County, WisconsinLimited DataOligotrophic
Lake Mary is a cold, clear oligotrophic lake in Iron County, MI. Water quality is graded A based on 1 sampling years through 2022. The lake supports 1 documented fish species including Walleye. Compared to the 38 other monitored lakes in Iron County, Lake Mary ranks #15 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2022-09-14. Grade methodology: LakeGrade methodology.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 19.5 ft down. Trophic State Index: 34.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 19.5 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 34 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for Lake Mary (14-day solunar calendar)
→ Is it safe to eat fish from Lake Mary? (mercury & PFAS guide)
→ Lake Mary fishing regulations (limits, seasons, special rules)
Location
County Ranking
Ranked #15 of 39 lakes in Iron County
Nearby Lakes in Iron County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Mecosta County · Clarity: 12.8 ft
Benzie County · Clarity: 13.5 ft
Clare County · Clarity: 15 ft
Kalkaska County · Clarity: 16 ft
Gogebic County · Clarity: 18 ft
Leelanau County · Clarity: 15.5 ft
Oligotrophic Lakes in Wisconsin
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-09-14
Monitoring stations: 1