Corey Lake
St. Joseph County, Michigan597 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.
- Limited data
Corey Lake in St. Joseph County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14.5 ft visibility. Surface area: 596.5 acres.
- Clarity
- 14.5 ft
- Area
- 597 acres
- Trend
- ↑ Improving
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Watch Corey Lake’s letter
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Free interactive depth-contour map of Corey Lake, reaching a maximum surveyed depth of 70 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Why Corey Lake has no grade
Corey 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, Corey Lake is Not Rated — not an F. Its 14.5-foot median from 137 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.
Corey Lake is a 597-acre lake in St. Joseph County, Michigan. Overall water quality is improving over recent sampling years. The lake supports 13 documented fish species including Bluegill, Bluntnose minnow, and Grass pickerel.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-17. Grade methodology: LakeQuality methodology.
What Corey Lake is good for
From access and monitoring records, not editorial picks.
- Clear water14.5 ft of visibility
- Fishing13 species recorded
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Corey Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 14.5 ft. TSI 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 597 acres |
No bathymetric survey has been published for Corey Lake, so its depth is not documented here.
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Corey Lake
Water Quality Trend: ↑ Improving
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.488 m/yr | 7 |
| Phosphorus | → Stable | +0.12 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.05 µg/L/yr | 3 |
Graded lakes near Corey Lake
Corey Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in St. Joseph County
Frequently asked questions about Corey Lake
Where is Corey Lake?
- Corey Lake is a lake in St. Joseph 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 Corey Lake?
- Corey Lake in St. Joseph County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14.5 ft visibility. Surface area: 596.5 acres.
Is Corey Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
What fish are in Corey Lake?
- Fish species found in Corey Lake include Bluegill, Bluntnose minnow, Grass pickerel, Green sunfish, Hornyhead chub, Iowa darter, Lake chubsucker, Lake herring, Largemouth bass, Northern longear sunfish, Pumpkinseed, Western banded killifish, Yellow bullhead. Corey Lake is located in St. Joseph County, Michigan.
Explore Corey Lake across LakeQuality
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Where this data comes from
137 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
NALMS137 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.