West Maggie Lake; Mastodon Township is a productive, nutrient-rich eutrophic lake in Iron County, Michigan. Water quality is graded C based on 2 sampling years through 2023. Water clarity is improving over recent sampling years. Compared to the 38 other monitored lakes in Iron County, West Maggie Lake; Mastodon Township ranks #37 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-08-24. Grade methodology: LakeGrade methodology.
Watch West Maggie Lake; Mastodon Township water quality
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 8 ft. Chlorophyll-a: 15 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 15 µg/L | C |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near West Maggie Lake; Mastodon Township
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Fishing West 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 |
Water Temperature
West Maggie Lake; Mastodon Township averages about 60°F at the surface in summer, usually warmest in Aug (about 63°F) and coldest in May (about 54°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 50 field readings (2016–2016) via the EPA Water Quality Portal. See the full West Maggie Lake; Mastodon Township water temperature breakdown →
Location
County Ranking
Ranked #37 of 39 lakes in Iron County
Cleaner Lakes Within 30 Miles
West Maggie Lake; Mastodon Township holds Grade C. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Iron County
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High nutrients, frequent algae, reduced clarity
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Other Grade C Lakes in Michigan
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Gogebic County · Clarity: 7 ft
Gogebic County · Clarity: 9.5 ft
Eutrophic 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: 2023-08-24
Monitoring stations: 1