Grass Lake
Gladwin County, Michigan24 acresView mapDirections
EGLE publishes the water-quality measurements for Grass Lake. Here is what has been measured.
- 8 ft max depth
- Limited data
Grass Lake in Gladwin County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 4 ft visibility. Maximum depth: 8 ft. Surface area: 24.1 acres.
Grass Lake is a 24-acre lake in Gladwin County, Michigan with a maximum depth of 8 feet. Overall water quality is improving over recent sampling years. The lake supports 6 documented fish species including Bluntnose minnow, Fathead minnow, and Finescale dace.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-09. Methodology: how these readings are compared.
What Grass Lake is good for
From access and monitoring records, not editorial picks.
- Fishing6 species recorded
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Grass Lake is safe to swim in today is a call for the Michigan Department of Environment, Great Lakes, and Energy (EGLE) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Grass Lake
These are the measurements EGLE publishes for Grass Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4 ft. TSI 57.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 57 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Grass Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
8 ft
Surface area
24 acres
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Fish Species
Click a species to see every lake where it is documented.
Fishing Grass Lake
Water Quality Trend: Improving
Based on 4 years of monitoring (2019–2023).
Water clarity
Improving3 years
Phosphorus
Worsening+2.6 µg/L/yr4 years
Chlorophyll-a
Improving-0.2 µg/L/yr2 years
Nearby Lakes in Gladwin County
Frequently asked questions about Grass Lake
Where is Grass Lake?
- Grass Lake is a lake in Gladwin County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Grass Lake?
- Grass Lake in Gladwin County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 4 ft visibility. Maximum depth: 8 ft. Surface area: 24.1 acres.
Is Grass Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Grass Lake?
- Grass Lake has a maximum depth of 8 feet. The lake covers 24.1 acres.
What fish are in Grass Lake?
- Fish species found in Grass Lake include Bluntnose minnow, Fathead minnow, Finescale dace, Green sunfish, Smallmouth bass, Western banded killifish. Grass Lake is located in Gladwin County, Michigan.
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Where this data comes from
18 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
NALMS18 samples · 2021–2022
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.