Gun Lake
Mason County, Michigan232 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- #1 of 4 in the county
- 22 ft max depth
- Public access
- Limited data
Gun Lake in Mason County, Michigan has a water quality grade of A (Excellent). Water clarity: 14 ft visibility. Phosphorus: 9 µg/L. Chlorophyll-a (algae): 2.2 µg/L. Maximum depth: 22 ft. Surface area: 232.1 acres.
- Clarity
- 14 ft
- Typical in September
- 72°F
- Max depth
- 22 ft
- Area
- 232 acres
- Type
- Mesotrophic
- Public access
- Yes
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Gun Lake is a 232-acre mesotrophic lake in Mason County, Michigan with a maximum depth of 22 feet. Water quality is graded A based on 1 sampling years through 2021. The lake supports 6 documented fish species including Blackchin shiner, Bluegill, and Bluntnose minnow. Public access is available. Compared to the 3 other monitored lakes in Mason County, Gun Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2021-09-09. Grade methodology: LakeQuality methodology.
What Gun Lake is good for
From access and monitoring records, not editorial picks.
- Clear water14 ft of visibility
- Fishing6 species recorded
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Good clarity, visible to about 14 ft. Phosphorus 9 µg/L. Chlorophyll-a 2.2 µg/L. TSI 38. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14 ft | Not graded |
| Phosphorus | 9 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2.2 µg/L | Good |
| Trophic State Index (TSI) | 38 | Mesotrophic |
Moderate nutrients, good water quality
Water Temperature
Gun Lake typically sits around 72°F at the surface in September. Summer average is about 72°F. Usually warmest in Aug (about 76°F) and coldest in Jun (about 66°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 63 field readings (2021–2021) via the EPA Water Quality Portal. See the full Gun Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 22 ft |
| Surface Area | 232 acres |
| Public Access | Yes |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Gun Lake
County Ranking
Ranked #1 of 4 lakes in Mason County
Nearby Lakes in Mason County
Frequently asked questions about Gun Lake
Where is Gun Lake?
- Gun Lake is a lake in Mason County, Michigan. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Gun Lake?
- Gun Lake in Mason County, Michigan has a water quality grade of A (Excellent). Water clarity: 14 ft visibility. Phosphorus: 9 µg/L. Chlorophyll-a (algae): 2.2 µg/L. Maximum depth: 22 ft. Surface area: 232.1 acres.
Is Gun Lake safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Gun Lake?
- Gun Lake typically sits around 72°F at the surface in September, from 63 EPA Water Quality Portal field readings (2021–2021). That is a typical value for the month, not a live reading.
How deep is Gun Lake?
- Gun Lake has a maximum depth of 22 feet. The lake covers 232.1 acres.
What fish are in Gun Lake?
- Fish species found in Gun Lake include Blackchin shiner, Bluegill, Bluntnose minnow, Creek chub, Western banded killifish, Yellow perch. Gun Lake is located in Mason County, Michigan.
Explore Gun Lake across LakeQuality
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Where this data comes from
15 measurements from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS15 samples · 2021
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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.