Green Lake
Allegan County, Michigan295 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.
- 60 ft max depth
- Public access
- Limited data
Green Lake in Allegan County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8 ft visibility. Maximum depth: 60 ft. Surface area: 295.2 acres.
- Clarity
- 8 ft
- Max depth
- 60 ft
- Area
- 295 acres
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Green Lake’s letter
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Free interactive depth-contour map of Green Lake, reaching a maximum surveyed depth of 60 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Why Green Lake has no grade
Green 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, Green Lake is Not Rated — not an F. Its 8-foot median from 16 readings collected 2021–2022 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.
Green Lake is a 295-acre lake in Allegan County, Michigan with a maximum depth of 60 feet. Overall water quality is declining over recent sampling years. The lake supports 20 documented fish species including Bigmouth shiner, Black crappie, and Blackchin shiner. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-06. Grade methodology: LakeQuality methodology.
What Green Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing20 species recorded
- Deep water60 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 Green Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 8 ft. TSI 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 60 ft |
| Surface Area | 295 acres |
| Public Access | Yes |
Recreation & Access
- Green LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Green Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -11.38 m/yr | 2 |
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Green Lake under Clean Water Act (NPDES) discharge permits.
- Kent County Road CommissionCaledonia · 4.8 mi away · NPDES MIG080050
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Graded lakes near Green Lake
Green Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Allegan County
Frequently asked questions about Green Lake
Where is Green Lake?
- Green Lake is a lake in Allegan 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 Green Lake?
- Green Lake in Allegan County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8 ft visibility. Maximum depth: 60 ft. Surface area: 295.2 acres.
Is Green Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Green Lake?
- Green Lake has a maximum depth of 60 feet. The lake covers 295.2 acres.
What fish are in Green Lake?
- Fish species found in Green Lake include Bigmouth shiner, Black crappie, Blackchin shiner, Bluegill, Green sunfish, Hornyhead chub, Iowa darter, Johnny darter, Lake herring, Largemouth bass, Northern longear sunfish, Pumpkinseed, Rock bass, Sand shiner, Spotfin shiner, Striped shiner, Warmouth, White sucker, Yellow bullhead, Yellow perch. Green Lake is located in Allegan County, Michigan.
Are there boat ramps on Green Lake?
- Green Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Green Lake. Public access is listed as yes.
Explore Green Lake across LakeQuality
15.9 mi away · cable-pulled, no boat wake
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Where this data comes from
16 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS16 samples · 2021–2022
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Named boat-access points from the USGS National Boat Ramps inventory