Thue Lake
Elmore County, Alabama574 acresView mapDirections
ADEM publishes the water-quality measurements for Thue Lake. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
Thue Lake in Elmore County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 5.8 ft visibility. Phosphorus: 9 µg/L. Chlorophyll-a (algae): 2.7 µg/L. Surface area: 574 acres.
Thue Lake is a 574-acre mesotrophic lake in Elmore County, Alabama. Overall water quality is declining over recent sampling years. Compared to the 4 other monitored lakes in Elmore County, Thue Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, ADEM, last sampled 2026-04-28. Methodology: how these readings are compared.
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. Thue Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Thue 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 Thue Lake
These are the measurements ADEM publishes for Thue Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 5.8 ft. Phosphorus 9 µg/L. Chlorophyll-a 2.7 µg/L. TSI 43.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 5.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 9µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| 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. | 43 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Thue Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
574 acres
No bathymetric survey has been published for Thue Lake, so its depth is not documented here.
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Fishing Thue Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2013–2023).
Water clarity
Worsening5 years
Phosphorus
Stable+0.03 µg/L/yr5 years
Chlorophyll-a
Worsening+0.15 µg/L/yr5 years
Reservoir Info (USACE NID)
Thue Lake is a man-made reservoir impounded by the Thurlow (completed 1930), built primarily for hydroelectric on the Tallapoosa River; gravity-type dam, 62 ft tall and 1,926 ft long.
- Surface area
- 574 ac
- Normal storage
- 18,250 ac-ft
- Max storage
- 18,250 ac-ft
- Drainage area
- 3,300 sq mi
- Hazard class
- High
- Owner
- Alabama Power Company
All listed purposes: Hydroelectric;Recreation.
Source: USACE National Inventory of Dams, NID ID AL01422 · Operator website · Matched by proximity (0.27 km)
EPA Impairment Status
Thue Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption.
Source: EPA ATTAINS assessment unit AL03150110-0406-102 · Official waterbody report
Nearby Lakes in Elmore County
Frequently asked questions about Thue Lake
Where is Thue Lake?
- Thue Lake is a lake in Elmore County, Alabama. Its water-quality measurements are published by ADEM and shown on this page as reported.
What is the water quality of Thue Lake?
- Thue Lake in Elmore County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 5.8 ft visibility. Phosphorus: 9 µg/L. Chlorophyll-a (algae): 2.7 µg/L. Surface area: 574 acres.
Is Thue Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Thue Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Explore Thue Lake across LakeQuality
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Other Lakes in Alabama
Mesotrophic Lakes in Alabama
Where this data comes from
154 measurements from 1 monitoring station, 2013–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- ALABAMA DEPT. OF ENVIRONMENTAL MANAGEMENT - WATER QUALITY DATA
21AWIC154 samples · 2013–2026
Analytical methods
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- 2120 B ~ Color in Water by Visual Comparison
Monitoring station identifiers (1)
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