Stony Lake
Oceana County, Michigan270 acresView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Impaired · Oxygen depletion (low DO)
- 43 ft max depth
- Limited data
Stony Lake in Oceana County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.5 ft visibility. Maximum depth: 43 ft. Surface area: 270.2 acres.
- Clarity
- 6.5 ft
- Typical in September
- 65°F
- Max depth
- 43 ft
- Area
- 270 acres
- Trend
- ↑ Improving
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Stays near Stony Lake
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Watch Stony Lake’s letter
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Free interactive depth-contour map of Stony Lake, reaching a maximum surveyed depth of 43 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Why Stony Lake has no grade
Stony Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Stony Lake is Not Rated — not an F. Its 6.5-foot median from 90 readings collected 2016–2022 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by EGLE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Stony Lake is a 270-acre lake in Oceana County, Michigan with a maximum depth of 43 feet. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-15. Grade methodology: LakeQuality methodology.
What Stony Lake is good for
From access and monitoring records, not editorial picks.
- Deep water43 ft surveyed max depth
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Stony Lake is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
Water quality measurements for Stony Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 6.5 ft. TSI 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Water Temperature
Stony Lake typically sits around 65°F at the surface in September. Summer average is about 64°F. Usually warmest in Aug (about 66°F) and coldest in May (about 56°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 410 field readings (2012–2018) via the EPA Water Quality Portal. See the full Stony Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 43 ft |
| Surface Area | 270 acres |
Fishing Stony Lake
Water Quality Trend: ↑ Improving
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.372 m/yr | 7 |
| Phosphorus | ↑ Improving | -0.41 µg/L/yr | 7 |
| Chlorophyll-a | ↑ Improving | -0.26 µg/L/yr | 7 |
EPA Impairment Status
Stony 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 MI040601011006-01 · Official waterbody report
Graded lakes near Stony Lake
Stony Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Oceana County
Frequently asked questions about Stony Lake
Where is Stony Lake?
- Stony Lake is a lake in Oceana County, Michigan. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Stony Lake?
- Stony Lake in Oceana County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.5 ft visibility. Maximum depth: 43 ft. Surface area: 270.2 acres.
Is Stony Lake safe to swim in?
- The letter is not a swimming clearance. Stony Lake is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
What is the water temperature of Stony Lake?
- Stony Lake typically sits around 65°F at the surface in September, from 410 EPA Water Quality Portal field readings (2012–2018). That is a typical value for the month, not a live reading.
How deep is Stony Lake?
- Stony Lake has a maximum depth of 43 feet. The lake covers 270.2 acres.
Explore Stony Lake across LakeQuality
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Where this data comes from
90 measurements from 1 monitoring station, 2016–2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS90 samples · 2016–2022
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database