Gilbert Lake
Gilbert Lake in Oakland County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8.3 ft visibility. Maximum depth: 18 ft. Surface area: 59.5 acres.
- Clarity
- 8.3 ft
- Max depth
- 18 ft
- Area
- 60 acres
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Why Gilbert Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Gilbert Lake, 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. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. 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.
Gilbert Lake is a 60-acre lake in Oakland County, Michigan with a maximum depth of 18 feet.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2018-09-15. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedBacteria advisory
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Gilbert Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 8.3 ft. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.3 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Gilbert Lake
Compare lakeside cabins, hotels, and vacation rentals near Gilbert Lake in Oakland County, Michigan — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Gilbert Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 18 ft |
| Surface Area | 60 acres |
Fishing Gilbert Lake
EPA Impairment Status
Gilbert 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 MI040900040401-04 · Official waterbody report · Matched by proximity (1.86 km)
Graded lakes near Gilbert Lake
Gilbert Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Oakland County
Frequently asked questions about Gilbert Lake
Where is Gilbert Lake?
- Gilbert Lake is a lake in Oakland County, Michigan. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Gilbert Lake?
- Gilbert Lake in Oakland County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8.3 ft visibility. Maximum depth: 18 ft. Surface area: 59.5 acres.
Is Gilbert Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Gilbert Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Gilbert Lake?
- Gilbert Lake has a maximum depth of 18 feet. The lake covers 59.5 acres.
Explore Gilbert Lake across LakeQuality
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Where this data comes from
13 measurements from 1 monitoring station, 2018. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS13 samples · 2018
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