Island Lake Central Basin; Sherman Township is a cold, clear oligotrophic lake in Gladwin 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 2 public boat landings. Compared to the 8 other monitored lakes in Gladwin County, Island Lake Central Basin; Sherman Township ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-09-11. Grade methodology: LakeGrade methodology.
Watch Island Lake Central Basin; Sherman Township water quality
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 16.5 ft down. Chlorophyll-a: 3.2 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 16.5 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 3.2 µg/L | A |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Island Lake Central Basin; Sherman Township
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Fishing Island Lake Central Basin; Sherman Township
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.87 m/yr | 3 |
| Chlorophyll-a | ↑ Improving | -0.8 µg/L/yr | 2 |
Recreation & Access
Location
County Ranking
Ranked #2 of 9 lakes in Gladwin County
Nearby Lakes in Gladwin County
Explore Island Lake Central Basin; Sherman Township across LakeGrade
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Fish species and best lakes in Gladwin County
Species activity outlook by water temperature and season
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Low nutrients, clear water, excellent for swimming
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Other Grade A Lakes in Michigan
Clare County · Clarity: 17.5 ft
Roscommon County · Clarity: 35 ft
Roscommon County · Clarity: 34 ft
Roscommon County · Clarity: 34.5 ft
Clare County · Clarity: 15 ft
Clare County · Clarity: 15 ft
Oligotrophic 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
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2023-09-11
Monitoring stations: 1