Robbins Lake
Cass County, Michigan56 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.
- 50 ft max depth
- Limited data
Robbins Lake in Cass County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 12.3 ft visibility. Maximum depth: 50 ft. Surface area: 56 acres.
- Clarity
- 12.3 ft
- Max depth
- 50 ft
- Area
- 56 acres
- Trend
- ↓ Declining
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Watch Robbins Lake’s letter
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Free interactive depth-contour map of Robbins Lake, reaching a maximum surveyed depth of 50 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Why Robbins Lake has no grade
Robbins 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, Robbins Lake is Not Rated — not an F. Its 12.3-foot median from 35 readings collected 2019–2021 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.
Robbins Lake is a 56-acre lake in Cass County, Michigan with a maximum depth of 50 feet. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2021-09-10. Grade methodology: LakeQuality methodology.
What Robbins Lake is good for
From access and monitoring records, not editorial picks.
- Clear water12.3 ft of visibility
- Deep water50 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 Robbins Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 12.3 ft. TSI 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12.3 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 50 ft |
| Surface Area | 56 acres |
Fishing Robbins Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.895 m/yr | 2 |
| Phosphorus | → Stable | 0 µg/L/yr | 2 |
Graded lakes near Robbins Lake
Robbins Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Cass County
Frequently asked questions about Robbins Lake
Where is Robbins Lake?
- Robbins Lake is a lake in Cass 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 Robbins Lake?
- Robbins Lake in Cass County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 12.3 ft visibility. Maximum depth: 50 ft. Surface area: 56 acres.
Is Robbins Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Robbins Lake?
- Robbins Lake has a maximum depth of 50 feet. The lake covers 56 acres.
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Where this data comes from
35 measurements from 1 monitoring station, 2019–2021. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS35 samples · 2019–2021
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.