Gull Lake
Kalamazoo County, Michigan2,050 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.
- Impaired · Mercury
- 110 ft max depth
- Limited data
Gull Lake in Kalamazoo County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13 ft visibility. Maximum depth: 110 ft. Surface area: 2050 acres.
- Clarity
- 13 ft
- Max depth
- 110 ft
- Area
- 2,050 acres
- Trend
- ↑ Improving
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Watch Gull Lake’s letter
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Free interactive depth-contour map of Gull Lake, reaching a maximum surveyed depth of 110 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Why Gull Lake has no grade
Gull 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, Gull Lake is Not Rated — not an F. Its 13-foot median from 102 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.
Gull Lake is a 2,050-acre lake in Kalamazoo County, Michigan with a maximum depth of 110 feet. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-17. Grade methodology: LakeQuality methodology.
What Gull Lake is good for
From access and monitoring records, not editorial picks.
- Clear water13 ft of visibility
- Deep water110 ft surveyed max depth
- Big water2,050 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Gull Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, pFAS, pCBs. Check local advisories before you swim.
Water quality measurements for Gull Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 13 ft. TSI 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 110 ft |
| Surface Area | 2,050 acres |
Fishing Gull Lake
Water Quality Trend: ↑ Improving
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.239 m/yr | 8 |
| Phosphorus | ↑ Improving | -0.25 µg/L/yr | 7 |
| Chlorophyll-a | → Stable | +0.02 µg/L/yr | 7 |
Reservoir Info (USACE NID)
Gull Lake is a man-made reservoir impounded by the Gull Lake Dam (completed 1920), built primarily for recreation on the Gull Lake Outlet; earth-type dam, 21 ft tall and 260 ft long.
- Surface area
- 2,050 ac
- Normal storage
- 0 ac-ft
- Max storage
- 5,393 ac-ft
- Drainage area
- 29 sq mi
- Hazard class
- Low
- Owner
- Gull Lake Association
Source: USACE National Inventory of Dams, NID ID MI00565 · Operator website
EPA Impairment Status
Gull Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040500030507-04 · Official waterbody report
Graded lakes near Gull Lake
Gull Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Kalamazoo County
Frequently asked questions about Gull Lake
Where is Gull Lake?
- Gull Lake is a lake in Kalamazoo 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 Gull Lake?
- Gull Lake in Kalamazoo County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13 ft visibility. Maximum depth: 110 ft. Surface area: 2050 acres.
Is Gull Lake safe to swim in?
- The letter is not a swimming clearance. Gull Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, pFAS, pCBs. Check local advisories before you swim.
How deep is Gull Lake?
- Gull Lake has a maximum depth of 110 feet. The lake covers 2050 acres.
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Where this data comes from
102 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
NALMS102 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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database