Smith Lake
Cullman County, AlabamaView mapDirections
ADEM publishes the water-quality measurements for Smith Lake. Here is what has been measured.
- Impaired · Mercury
- Limited data
Ask about Smith Lake
Answers come straight from the public measurements and survey records on this page.
Smith Lake in Cullman County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 9.8 ft visibility.
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Smith Lake is a lake in Cullman County, Alabama.
Source: EPA Water Quality Portal sampling records, ADEM, last sampled 2022-12-27. Grade methodology: LakeQuality methodology.
What Smith Lake is good for
From access and monitoring records, not editorial picks.
- Clear water9.8 ft of visibility
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Smith Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Smith 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 Smith Lake
These are the measurements ADEM publishes for Smith Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 9.8 ft. TSI 44.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.8 ft | Measured, not scored |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Smith Lake
EPA Impairment Status
Smith Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit AL03160110-0408-110 · Official waterbody report · Matched by proximity (2.68 km)
Nearby Lakes in Cullman County
Frequently asked questions about Smith Lake
Where is Smith Lake?
- Smith Lake is a lake in Cullman County, Alabama. Its water-quality measurements are published by ADEM and shown on this page as reported.
What is the water quality of Smith Lake?
- Smith Lake in Cullman County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 9.8 ft visibility.
Is Smith Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Smith Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
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Where this data comes from
386 measurements from 15 monitoring stations, 2012–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Alabama Water Watch
AWW_WQX386 samples · 2012–2022
Analytical methods
- AWW QAPP
Monitoring station identifiers (15)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database