Black Lake Southwest Basin; Grant Township is a cold, clear oligotrophic lake in Cheboygan County, Michigan. Water quality is graded A based on 2 sampling years through 2023. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 6 other monitored lakes in Cheboygan County, Black Lake Southwest Basin; Grant Township ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-09-03. Grade methodology: LakeGrade methodology.
Watch Black Lake Southwest Basin; Grant Township water quality
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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 13 ft. Chlorophyll-a: 1.8 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 1.8 µg/L | A |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Black Lake Southwest Basin; Grant Township
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Fishing Black Lake Southwest Basin; Grant Township
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +8.12 m/yr | 2 |
Recreation & Access
Water Temperature
Black Lake Southwest Basin; Grant Township averages about 64°F at the surface in summer, usually warmest in Aug (about 69°F) and coldest in May (about 53°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 135 field readings (2023–2023) via the EPA Water Quality Portal. See the full Black Lake Southwest Basin; Grant Township water temperature breakdown →
Location
County Ranking
Ranked #5 of 7 lakes in Cheboygan County
Nearby Lakes in Cheboygan County
Explore Black Lake Southwest Basin; Grant Township across LakeGrade
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Species activity outlook by water temperature and season
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Low nutrients, clear water, excellent for swimming
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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
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2023-09-03
Monitoring stations: 1