Loon Lake is a mesotrophic lake in Benzie County, Michigan. Water quality is graded B based on 1 sampling years through 2022. Overall water quality is declining over recent sampling years. The lake supports 13 documented fish species including Black bullhead, Blackchin shiner, and Bluegill. Compared to the 34 other monitored lakes in Benzie County, Loon Lake ranks #25 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-09-10. Grade methodology: LakeGrade methodology.
Watch Loon Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 12 ft. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Loon Lake
Compare lakeside cabins, hotels, and vacation rentals near Loon Lake in Benzie 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.
Top-rated places to stay near Loon Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Loon Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Loon Lake — straight to your inbox. No spam, unsubscribe anytime.
Planning a whole trip? See where to stay at Michigan’s top lakes →
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Loon Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.059 m/yr | 5 |
| Phosphorus | ↓ Declining | +3.52 µg/L/yr | 5 |
Location
County Ranking
Ranked #25 of 35 lakes in Benzie County
Cleaner Lakes Within 30 Miles
Loon Lake holds Grade B. 3 nearby lakes hold higher grades.
Nearby Lakes in Benzie County
Explore Loon Lake across LakeGrade
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Benzie County
Species activity outlook by water temperature and season
Top lakes and where to stay in the Grand Traverse Region area
Where to stay at Michigan's top lakes, each with its grade
Moderate nutrients, good water quality
Michigan's cleanest and most-polluted lakes, ranked
More Michigan Lake Rankings
Other Grade B Lakes in Michigan
Leelanau County · Clarity: 8.5 ft
Leelanau County · Clarity: 9 ft
Manistee County · Clarity: 11 ft
Manistee County · Clarity: 11 ft
Leelanau County · Clarity: 8.6 ft
Leelanau County · Clarity: 13 ft
Mesotrophic Lakes in Michigan
More records, surveys & data sources
EPA Impairment Status
Loon Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MI040601040206-05 · Official waterbody report
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-09-10
Monitoring stations: 1