Blue Lake
Mecosta County, Michigan221 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.
- 50 ft max depth
- Limited data
Blue Lake in Mecosta County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10.5 ft visibility. Maximum depth: 50 ft. Surface area: 221.3 acres.
- Clarity
- 10.5 ft
- Max depth
- 50 ft
- Area
- 221 acres
- Trend
- ↓ Declining
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Watch Blue Lake’s letter
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Free interactive depth-contour map of Blue Lake, reaching a maximum surveyed depth of 50 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Why Blue Lake has no grade
Blue 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, Blue Lake is Not Rated — not an F. Its 10.5-foot median from 77 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.
Blue Lake is a 221-acre lake in Mecosta County, Michigan with a maximum depth of 50 feet. Overall water quality is declining over recent sampling years. The lake supports 3 documented fish species including Brook stickleback, Brook trout, and Central mudminnow.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-15. Grade methodology: LakeQuality methodology.
What Blue Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.5 ft of visibility
- Fishing3 species recorded
- Deep water50 ft surveyed max depth
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Blue Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 10.5 ft. TSI 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 50 ft |
| Surface Area | 221 acres |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Blue Lake
Water Quality Trend: ↓ Declining
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.025 m/yr | 7 |
| Phosphorus | → Stable | -0.02 µg/L/yr | 7 |
| Chlorophyll-a | ↓ Declining | +0.21 µg/L/yr | 7 |
Graded lakes near Blue Lake
Blue Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Mecosta County
Frequently asked questions about Blue Lake
Where is Blue Lake?
- Blue Lake is a lake in Mecosta 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 Blue Lake?
- Blue Lake in Mecosta County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10.5 ft visibility. Maximum depth: 50 ft. Surface area: 221.3 acres.
Is Blue Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Blue Lake?
- Blue Lake has a maximum depth of 50 feet. The lake covers 221.3 acres.
What fish are in Blue Lake?
- Fish species found in Blue Lake include Brook stickleback, Brook trout, Central mudminnow. Blue Lake is located in Mecosta County, Michigan.
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Where this data comes from
77 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
NALMS77 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.