Sargent Lake is a mesotrophic lake in Keweenaw County, Michigan. Water quality is graded A based on 2 sampling years through 2024. Overall water quality is declining over recent sampling years. The lake supports 1 documented fish species including Blackchin shiner. Compared to the 18 other monitored lakes in Keweenaw County, Sargent Lake ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2024-08-28. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 10.4 ft. Phosphorus level: 17.3 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.4 ft | B |
| Phosphorus | 17.3 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Sargent Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Sargent Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.143 m/yr | 5 |
| Phosphorus | ↓ Declining | +3.35 µg/L/yr | 5 |
Water Temperature
Sargent Lake averages about 61°F at the surface in summer, usually warmest in Jul (about 62°F) and coldest in May (about 47°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 928 field readings (2010–2024) via the EPA Water Quality Portal. See the full Sargent Lake water temperature breakdown →
Location
County Ranking
Ranked #8 of 19 lakes in Keweenaw County
Nearby Lakes in Keweenaw County
Explore Sargent Lake across LakeGrade
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Species activity outlook by water temperature and season
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Moderate nutrients, good water quality
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Other Grade A Lakes in Michigan
Iron County · Clarity: 20 ft
Iron County · Clarity: 20 ft
Iron County · Clarity: 15.5 ft
Gogebic County · Clarity: 15.7 ft
Iron County · Clarity: 18 ft
Iron County · Clarity: 17 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: 2024-08-28
Monitoring stations: 1