Big Crooked Lake
Kent County, Michigan145 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
Big Crooked Lake in Kent County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 11.5 ft visibility. Surface area: 144.5 acres.
- Clarity
- 11.5 ft
- Area
- 145 acres
- Trend
- ↓ Declining
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Watch Big Crooked Lake’s letter
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Why Big Crooked Lake has no grade
Big Crooked 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, Big Crooked Lake is Not Rated — not an F. Its 11.5-foot median from 28 readings collected 2018–2021 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.
Big Crooked Lake is a 145-acre lake in Kent County, Michigan. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2021-09-18. Grade methodology: LakeQuality methodology.
What Big Crooked Lake is good for
From access and monitoring records, not editorial picks.
- Clear water11.5 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Big Crooked Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 11.5 ft. TSI 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 145 acres |
No bathymetric survey has been published for Big Crooked Lake, so its depth is not documented here.
Fishing Big Crooked Lake
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.394 m/yr | 4 |
| Phosphorus | → Stable | -0.13 µg/L/yr | 3 |
Graded lakes near Big Crooked Lake
Big Crooked Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Kent County
Frequently asked questions about Big Crooked Lake
Where is Big Crooked Lake?
- Big Crooked Lake is a lake in Kent 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 Big Crooked Lake?
- Big Crooked Lake in Kent County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 11.5 ft visibility. Surface area: 144.5 acres.
Is Big Crooked Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
28 measurements from 1 monitoring station, 2018–2021. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS28 samples · 2018–2021
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.