Moon Lake
Gogebic County, Michigan95 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Oligotrophic
- #1 of 21 in the county
Moon Lake in Gogebic County, Michigan has a water quality grade of A (Excellent). Water clarity: 18 ft visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 2 µg/L. Surface area: 94.6 acres.
- Clarity
- 18 ft
- Area
- 95 acres
- Type
- Oligotrophic
- Trend
- ↑ Improving
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Watch Moon Lake’s letter
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Moon Lake is a 95-acre cold, clear oligotrophic lake in Gogebic County, Michigan. Water quality is graded A based on 2 sampling years through 2023. Overall water quality is improving over recent sampling years. Compared to the 20 other monitored lakes in Gogebic County, Moon Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2023-09-16. Grade methodology: LakeQuality methodology.
What Moon Lake is good for
From access and monitoring records, not editorial picks.
- Clear water18 ft of visibility
Swimming Safety
Grade onlyLow algae
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)
Crystal clear, you can see 18 ft down. Phosphorus 10 µg/L. Chlorophyll-a 2 µg/L. TSI 37. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 18 ft | Not graded |
| Phosphorus | 10 µg/L | Good |
| Chlorophyll-a (Algae) | 2 µg/L | Good |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 95 acres |
No bathymetric survey has been published for Moon Lake, so its depth is not documented here.
Fishing Moon Lake
Water Quality Trend: ↑ Improving
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.748 m/yr | 8 |
| Phosphorus | ↑ Improving | -0.64 µg/L/yr | 7 |
| Chlorophyll-a | ↓ Declining | +0.21 µg/L/yr | 7 |
County Ranking
Ranked #1 of 21 lakes in Gogebic County
Nearby Lakes in Gogebic County
Frequently asked questions about Moon Lake
Where is Moon Lake?
- Moon Lake is a lake in Gogebic County, Michigan. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Moon Lake?
- Moon Lake in Gogebic County, Michigan has a water quality grade of A (Excellent). Water clarity: 18 ft visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 2 µg/L. Surface area: 94.6 acres.
Is Moon Lake safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Moon Lake across LakeQuality
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Fish species and best lakes in Gogebic County
Species activity outlook by water temperature and season
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Where to stay at Michigan's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
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Where this data comes from
170 measurements from 1 monitoring station, 2016–2023. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS170 samples · 2016–2023
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.