North Crooked Lake
Kalkaska County, Michigan24 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
North Crooked Lake in Kalkaska County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14 ft visibility. Surface area: 23.5 acres.
- Clarity
- 14 ft
- Area
- 24 acres
- Trend
- → Stable
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Watch North Crooked Lake’s letter
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Why North Crooked Lake has no grade
North 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, North Crooked Lake is Not Rated — not an F. Its 14-foot median from 64 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.
North Crooked Lake is a 24-acre lake in Kalkaska County, Michigan. Water clarity is improving over recent sampling years. The lake supports 6 documented fish species including Golden shiner, Iowa darter, and Smallmouth bass.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-10. Grade methodology: LakeQuality methodology.
What North Crooked Lake is good for
From access and monitoring records, not editorial picks.
- Clear water14 ft of visibility
- Fishing6 species recorded
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for North Crooked Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 14 ft. TSI 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14 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 | 24 acres |
No bathymetric survey has been published for North Crooked Lake, so its depth is not documented here.
Fish Species
Click a species to see every graded lake where it is documented.
Fishing North Crooked Lake
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.255 m/yr | 7 |
| Phosphorus | → Stable | +0.02 µg/L/yr | 6 |
| Chlorophyll-a | ↓ Declining | +0.05 µg/L/yr | 5 |
Graded lakes near North Crooked Lake
North Crooked Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Kalkaska County
Frequently asked questions about North Crooked Lake
Where is North Crooked Lake?
- North Crooked Lake is a lake in Kalkaska 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 North Crooked Lake?
- North Crooked Lake in Kalkaska County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14 ft visibility. Surface area: 23.5 acres.
Is North Crooked Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
What fish are in North Crooked Lake?
- Fish species found in North Crooked Lake include Golden shiner, Iowa darter, Smallmouth bass, Western banded killifish, White sucker, Yellow perch. North Crooked Lake is located in Kalkaska County, Michigan.
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Where this data comes from
64 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
NALMS64 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.