Lake Ahmik is a mesotrophic lake in Keweenaw County, Michigan. Water quality is graded B based on 2 sampling years through 2024. Overall water quality is declining over recent sampling years. The lake supports 2 documented fish species including Northern pike and Yellow perch. Compared to the 18 other monitored lakes in Keweenaw County, Lake Ahmik ranks #14 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2024-08-23. Grade methodology: LakeGrade methodology.
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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 ft. Phosphorus level: 17 µg/L. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7 ft | C |
| Phosphorus | 17 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lake Ahmik
Compare lakeside cabins, hotels, and vacation rentals near Lake Ahmik in Keweenaw County, Michigan — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lake Ahmik
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Source: USGS Nonindigenous Aquatic Species (NAS) Database. Hover a chip to see scientific name, ecological context, status, and first-observed year.
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.045 m/yr | 5 |
| Phosphorus | ↓ Declining | +4.04 µg/L/yr | 5 |
Water Temperature
Lake Ahmik averages about 69°F at the surface in summer, usually warmest in Jul (about 71°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 425 field readings (2010–2024) via the EPA Water Quality Portal. See the full Lake Ahmik water temperature breakdown →
Location
County Ranking
Ranked #14 of 19 lakes in Keweenaw County
Cleaner Lakes Within 30 Miles
Lake Ahmik holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Keweenaw County
Explore Lake Ahmik across LakeGrade
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Keweenaw County
Species activity outlook by water temperature and season
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Where to stay at Michigan's top lakes, each with its grade
Moderate nutrients, good water quality
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More Michigan Lake Rankings
Other Grade B Lakes in Michigan
Marquette County · Clarity: 12 ft
Iron County · Clarity: 14.5 ft
Gogebic County · Clarity: 9.5 ft
Gogebic County · Clarity: 12 ft
Gogebic County · Clarity: 10.3 ft
Gogebic County · Clarity: 11.5 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: 2024-08-23
Monitoring stations: 1