Little Maggie Lake; Mastodon Township is a cold, clear oligotrophic lake in Iron County, Michigan. Water quality is graded B based on 1 sampling years through 2023. Water clarity is improving over recent sampling years. Compared to the 38 other monitored lakes in Iron County, Little Maggie Lake; Mastodon Township ranks #30 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-09-05. Grade methodology: LakeGrade methodology.
Watch Little Maggie Lake; Mastodon Township water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 13.5 ft. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.5 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Little Maggie Lake; Mastodon Township
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Fishing Little Maggie Lake; Mastodon Township
Water Quality Trend: → Stable
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +8.17 m/yr | 2 |
| Chlorophyll-a | ↓ Declining | +2.3 µg/L/yr | 3 |
Location & Depth Map
Free interactive depth-contour map of Little Maggie Lake; Mastodon Township, reaching a maximum surveyed depth of 30 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #30 of 39 lakes in Iron County
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Little Maggie Lake; Mastodon Township holds Grade B. One nearby lake has a higher grade.
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Other Grade B Lakes in Michigan
Marquette County · Clarity: 12 ft
Dickinson County · Clarity: 13.8 ft
Dickinson County · Clarity: 13.8 ft
Dickinson County · Clarity: 12.5 ft
Dickinson County · Clarity: 12.5 ft
Dickinson County · Clarity: 11.5 ft
Oligotrophic Lakes in Michigan
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-09-05
Monitoring stations: 1