Lake Mary Northwest Basin; Mastodon Township
Iron County, WisconsinOligotrophic
Lake Mary Northwest Basin; Mastodon Township is a cold, clear oligotrophic lake in Iron County, MI. Water quality is graded A based on 2 sampling years through 2023. Compared to the 38 other monitored lakes in Iron County, Lake Mary Northwest Basin; Mastodon Township ranks #14 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-09-16. 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 18 ft down. Chlorophyll-a: 3 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 18 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 3 µg/L | A |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Location
County Ranking
Ranked #14 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: 2023-09-16
Monitoring stations: 1