Jewell Lake
Alcona County, Michigan184 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- #3 of 3 in the county
- 30 ft max depth
- Limited data
Jewell Lake in Alcona County, Michigan has a water quality grade of A (Excellent). Water clarity: 10.5 ft visibility. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 4.3 µg/L. Maximum depth: 30 ft. Surface area: 184.4 acres.
- Clarity
- 10.5 ft
- Typical in September
- 69°F
- Max depth
- 30 ft
- Area
- 184 acres
- Type
- Mesotrophic
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Watch Jewell Lake’s letter
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Jewell Lake is a 184-acre mesotrophic lake in Alcona County, Michigan with a maximum depth of 30 feet. Water quality is graded A based on 1 sampling years through 2022. Compared to the 2 other monitored lakes in Alcona County, Jewell Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-11. Grade methodology: LakeQuality methodology.
What Jewell Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.5 ft of visibility
- Deep water30 ft surveyed max depth
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 10.5 ft. Phosphorus 11 µg/L. Chlorophyll-a 4.3 µg/L. TSI 42. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft | Not graded |
| Phosphorus | 11 µg/L | Not graded |
| Chlorophyll-a (Algae) | 4.3 µg/L | Good |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Water Temperature
Jewell Lake typically sits around 69°F at the surface in September. Summer average is about 72°F. Usually warmest in Aug (about 73°F) and coldest in Sep (about 69°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 36 field readings (2022–2022) via the EPA Water Quality Portal. See the full Jewell Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 30 ft |
| Surface Area | 184 acres |
Fishing Jewell Lake
County Ranking
Ranked #3 of 3 lakes in Alcona County
Nearby Lakes in Alcona County
Frequently asked questions about Jewell Lake
Where is Jewell Lake?
- Jewell Lake is a lake in Alcona County, Michigan. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Jewell Lake?
- Jewell Lake in Alcona County, Michigan has a water quality grade of A (Excellent). Water clarity: 10.5 ft visibility. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 4.3 µg/L. Maximum depth: 30 ft. Surface area: 184.4 acres.
Is Jewell 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 Jewell Lake?
- Jewell Lake typically sits around 69°F at the surface in September, from 36 EPA Water Quality Portal field readings (2022–2022). That is a typical value for the month, not a live reading.
How deep is Jewell Lake?
- Jewell Lake has a maximum depth of 30 feet. The lake covers 184.4 acres.
Explore Jewell Lake across LakeQuality
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Where this data comes from
17 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS17 samples · 2022
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.