Hamlin Lake
Mason County, Michigan4,644 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
- 65 ft max depth
- Public access
- Limited data
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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Watch Hamlin Lake’s letter
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Why Hamlin Lake has no grade
Hamlin 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, Hamlin Lake is Not Rated — not an F. Its 9-foot median from 227 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.
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 1 public boat landing.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-15. Grade methodology: LakeQuality methodology.
What Hamlin Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing3 species recorded
- Deep water65 ft surveyed max depth
- Big water4,644 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Hamlin Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen), oxygen depletion (low DO). Check local advisories before you swim.
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. TSI 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
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 65 ft |
| Surface Area | 4,644 acres |
| Public Access | Yes |
Recreation & Access
- 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) — 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 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?
- The letter is not a swimming clearance. Hamlin Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen), oxygen depletion (low DO). Check local advisories before you swim.
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 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Victory Menorial Park. Public access is listed as yes.
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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