Loon Lake
Iosco County, Michigan417 acresView mapDirections
EGLE publishes the water-quality measurements for Loon Lake. Here is what has been measured.
- 128 ft max depth
- Public access
- Limited data
Loon Lake in Iosco County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 23 ft visibility. Maximum depth: 128 ft. Surface area: 416.6 acres.
Loon Lake is a 417-acre lake in Iosco County, Michigan with a maximum depth of 128 feet. Water clarity is declining over recent sampling years. The lake supports 1 documented fish species including Lake herring. Public access is available.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2018-09-07. Methodology: how these readings are compared.
What Loon Lake is good for
From access and monitoring records, not editorial picks.
- Clear water23 ft of visibility
- Deep water128 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Loon Lake is safe to swim in today is a call for the Michigan Department of Environment, Great Lakes, and Energy (EGLE) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Loon Lake
These are the measurements EGLE publishes for Loon Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 23 ft down. TSI 32.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 23ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 32 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Loon Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
128 ft
Surface area
417 acres
Public access
Yes
Listed by EGLE
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Fish Species
Click a species to see every lake where it is documented.
Fishing Loon Lake
Water quality readings over time
3 seasons of samples on record (2016–2018). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening3 years
Phosphorus
Improving-1.5 µg/L/yr3 years
Nearby Lakes in Iosco County
Frequently asked questions about Loon Lake
Where is Loon Lake?
- Loon Lake is a lake in Iosco County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Loon Lake?
- Loon Lake in Iosco County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 23 ft visibility. Maximum depth: 128 ft. Surface area: 416.6 acres.
Is Loon Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Loon Lake?
- Loon Lake has a maximum depth of 128 feet. The lake covers 416.6 acres.
What fish are in Loon Lake?
- Fish species found in Loon Lake include Lake herring. Loon Lake is located in Iosco County, Michigan.
Can I fish at Loon Lake?
- Public access to Loon Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Michigan's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
29 measurements from 1 monitoring station, 2016–2018. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS29 samples · 2016–2018
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.