Smiw Lake
Winston County, AlabamaView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- #1 of 2 in the county
Smiw Lake in Winston County, Alabama has a water quality grade of A (Excellent). Water clarity: 11.5 ft visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 2.7 µg/L.
- Clarity
- 11.5 ft
- Type
- Mesotrophic
- Phosphorus
- 8 µg/L
- Chlorophyll-a
- 2.7 µg/L
- Trend
- ↓ Declining
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Stays near Smiw Lake
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Watch Smiw Lake’s letter
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Smiw Lake is a mesotrophic lake in Winston County, Alabama. Water quality is graded A based on 2 sampling years through 2024. Overall water quality is declining over recent sampling years. Compared to the 1 other monitored lakes in Winston County, Smiw Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, ADEM, last sampled 2024-10-22. Grade methodology: LakeQuality methodology.
What Smiw Lake is good for
From access and monitoring records, not editorial picks.
- Clear water11.5 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)
Good clarity, visible to about 11.5 ft. Phosphorus 8 µg/L. Chlorophyll-a 2.7 µg/L. TSI 39. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.5 ft | Not graded |
| Phosphorus | 8 µg/L | Good |
| Chlorophyll-a (Algae) | 2.7 µg/L | Good |
| Trophic State Index (TSI) | 39 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Smiw Lake
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.006 m/yr | 4 |
| Phosphorus | ↓ Declining | +0.45 µg/L/yr | 4 |
| Chlorophyll-a | ↓ Declining | +0.25 µg/L/yr | 4 |
County Ranking
Ranked #1 of 2 lakes in Winston County
Nearby Lakes in Winston County
Frequently asked questions about Smiw Lake
Where is Smiw Lake?
- Smiw Lake is a lake in Winston County, Alabama. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Smiw Lake?
- Smiw Lake in Winston County, Alabama has a water quality grade of A (Excellent). Water clarity: 11.5 ft visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 2.7 µg/L.
Is Smiw Lake safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Smiw Lake across LakeQuality
More Alabama Lake Rankings
Other Grade A Lakes in Alabama
Mesotrophic Lakes in Alabama
Where this data comes from
490 measurements from 5 monitoring stations, 2012–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- ALABAMA DEPT. OF ENVIRONMENTAL MANAGEMENT - WATER QUALITY DATA
21AWIC490 samples · 2012–2024
Analytical methods
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
Monitoring station identifiers (5)
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.