Trapper'S Lake is a mesotrophic lake in Alger County, Michigan. Water quality is graded B based on 2 sampling years through 2024. Overall water quality is declining over recent sampling years. Compared to the 12 other monitored lakes in Alger County, Trapper'S Lake ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2024-08-21. Grade methodology: LakeGrade methodology.
Watch Trapper'S Lake water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 7.5 ft. Phosphorus level: 9.2 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.5 ft | C |
| Phosphorus | 9.2 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Trapper'S Lake
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Fishing Trapper'S Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.14 m/yr | 5 |
| Phosphorus | ↓ Declining | +32.8 µg/L/yr | 2 |
Water Temperature
Trapper'S Lake averages about 72°F at the surface in summer, usually warmest in Jul (about 75°F) and coldest in Jun (about 70°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 370 field readings (2012–2024) via the EPA Water Quality Portal. See the full Trapper'S Lake water temperature breakdown →
Location & Depth Map
Free interactive depth-contour map of Trapper'S Lake, reaching a maximum surveyed depth of 15 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #8 of 13 lakes in Alger County
Cleaner Lakes Within 30 Miles
Trapper'S Lake holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Alger County
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Moderate nutrients, good water quality
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Other Grade B Lakes in Michigan
Marquette County · Clarity: 12.5 ft
Marquette County · Clarity: 12 ft
Charlevoix County · Clarity: 10 ft
Charlevoix County · Clarity: 10 ft
Marquette County · Clarity: 14.3 ft
Marquette County · Clarity: 11.8 ft
Mesotrophic 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: 2024-08-21
Monitoring stations: 1