Hamlin Lake
Hamlin Lake in Mason County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 9 ft visibility. Maximum depth: 65 ft. Surface area: 4643.5 acres.
- Clarity
- 9 ft
- Max depth
- 65 ft
- Area
- 4,644 acres
- Trend
- → Stable
- Public access
- Yes
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Why Hamlin 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 Hamlin 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.
Hamlin Lake is a 4,644-acre lake in Mason County, Michigan with a maximum depth of 65 feet. The lake supports 3 documented fish species including Chestnut lamprey, Northern pike, and Smallmouth bass. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-15. Grade methodology: LakeQuality methodology.
Watch Hamlin Lake water quality
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Hamlin Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 9 ft. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Hamlin Lake
Compare lakeside cabins, hotels, and vacation rentals near Hamlin Lake in Mason 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 Hamlin Lake
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Planning a trip? Cabins and lodging at Hamlin Lake → · more Michigan lake trips
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 65 ft |
| Surface Area | 4,644 acres |
| Public Access | Yes |
Recreation & Access
- Big Sable RiverPublic
- Victory Menorial ParkPublic
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 Hamlin Lake
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.054 m/yr | 6 |
EPA Impairment Status
Hamlin 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 MI040601010104-02 · Official waterbody report
Graded lakes near Hamlin Lake
Hamlin Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Mason County
Frequently asked questions about Hamlin Lake
Where is Hamlin Lake?
- Hamlin Lake is a lake in Mason 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 Hamlin Lake?
- Hamlin Lake in Mason County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 9 ft visibility. Maximum depth: 65 ft. Surface area: 4643.5 acres.
Is Hamlin Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Hamlin 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 Hamlin Lake?
- Hamlin Lake has a maximum depth of 65 feet. The lake covers 4643.5 acres.
What fish are in Hamlin Lake?
- Fish species found in Hamlin Lake include Chestnut lamprey, Northern pike, Smallmouth bass. Hamlin Lake is located in Mason County, Michigan.
Are there boat ramps on Hamlin Lake?
- Hamlin Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Big Sable River, Victory Menorial Park. Public access is listed as yes.
Explore Hamlin Lake across LakeQuality
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Where this data comes from
227 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
NALMS227 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
Named boat-access points from the USGS National Boat Ramps inventory