Turtle Lake South Basin; Inland Township is a mesotrophic lake in Benzie County, Michigan. Water quality is graded B based on 1 sampling years through 2023. Overall water quality is improving over recent sampling years. Compared to the 34 other monitored lakes in Benzie County, Turtle Lake South Basin; Inland Township ranks #24 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-09-09. Grade methodology: LakeGrade methodology.
Watch Turtle Lake South Basin; Inland Township water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 13 ft. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Turtle Lake South Basin; Inland Township
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Fishing Turtle Lake South Basin; Inland Township
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +6.16 m/yr | 2 |
Water Temperature
Turtle Lake South Basin; Inland Township averages about 71°F at the surface in summer, usually warmest in Aug (about 75°F) and coldest in May (about 60°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 47 field readings (2019–2019) via the EPA Water Quality Portal. See the full Turtle Lake South Basin; Inland Township water temperature breakdown →
Location
County Ranking
Ranked #24 of 35 lakes in Benzie County
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Turtle Lake South Basin; Inland Township holds Grade B. One nearby lake has a higher grade.
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Moderate nutrients, good water quality
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Other Grade B Lakes in Michigan
Leelanau County · Clarity: 8.5 ft
Leelanau County · Clarity: 9 ft
Leelanau County · Clarity: 13 ft
Leelanau County · Clarity: 12.5 ft
Manistee County · Clarity: 11 ft
Manistee County · Clarity: 11 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: 2023-09-09
Monitoring stations: 1