Smiw Lake
Winston County, AlabamaView mapDirections
ADEM publishes the water-quality measurements for Smiw Lake. Here is what has been measured.
- Mesotrophic
Smiw Lake in Winston County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 11.5 ft visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 2.7 µg/L.
Smiw Lake is a mesotrophic lake in Winston County, Alabama. 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. Methodology: how these readings are compared.
What Smiw Lake is good for
From access and monitoring records, not editorial picks.
- Clear water11.5 ft of visibility
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Smiw Lake is safe to swim in today is a call for the Alabama Department of Environmental Management and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Smiw Lake
These are the measurements ADEM publishes for Smiw Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 11.5 ft. Phosphorus 8 µg/L. Chlorophyll-a 2.7 µg/L. TSI 39.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 11.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 8µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2.7µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 39 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Smiw Lake
Answers come straight from the public measurements and survey records on this page.
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Stays near Smiw Lake
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Fishing Smiw Lake
Water Quality Trend: Worsening
Based on 4 years of monitoring (2012–2024).
Water clarity
Stable4 years
Phosphorus
Worsening+0.45 µg/L/yr4 years
Chlorophyll-a
Worsening+0.25 µg/L/yr4 years
Nearby Lakes in Winston County
Frequently asked questions about Smiw Lake
Where is Smiw Lake?
- Smiw Lake is a lake in Winston County, Alabama. Its water-quality measurements are published by ADEM and shown on this page as reported.
What is the water quality of Smiw Lake?
- Smiw Lake in Winston County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 11.5 ft visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 2.7 µg/L.
Is Smiw Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Smiw Lake across LakeQuality
More lakes in Alabama
Other 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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.