Fjac Lake
Covington County, AlabamaView mapDirections
ADEM publishes the water-quality measurements for Fjac Lake. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
- 35 ft max depth
Fjac Lake in Covington County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 3.9 ft visibility. Phosphorus: 14 µg/L. Chlorophyll-a (algae): 8.5 µg/L.
Fjac Lake is a productive, nutrient-rich eutrophic lake in Covington County, Alabama with an estimated average depth of about 35 feet. Overall water quality is improving over recent sampling years. Compared to the 2 other monitored lakes in Covington County, Fjac Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, ADEM, last sampled 2024-10-31. 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. Fjac Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Fjac 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 Fjac Lake
These are the measurements ADEM publishes for Fjac 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 3.9 ft. Phosphorus 14 µg/L. Chlorophyll-a 8.5 µg/L. TSI 50.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 14µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 8.5µg/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. | 50 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~35 ft est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Alabama has not published bathymetry for Fjac Lake.
Lake Size & Watershed
Watershed (drainage) area
71 sq mi
HydroLAKES / HydroSHEDS
Surface area
941 acres
HydroLAKES / HydroSHEDS
Shoreline
9.6 mi
HydroLAKES / HydroSHEDS
Elevation
243 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
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Fishing Fjac Lake
Water Quality Trend: Improving
Based on 5 years of monitoring (2012–2024).
Water clarity
Stable5 years
Phosphorus
Improving-0.4 µg/L/yr5 years
Chlorophyll-a
Improving-0.25 µg/L/yr5 years
EPA Impairment Status
Fjac 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 AL03140103-0102-102 · Official waterbody report
Nearby Lakes in Covington County
Frequently asked questions about Fjac Lake
Where is Fjac Lake?
- Fjac Lake is a lake in Covington County, Alabama. Its water-quality measurements are published by ADEM and shown on this page as reported.
What is the water quality of Fjac Lake?
- Fjac Lake in Covington County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 3.9 ft visibility. Phosphorus: 14 µg/L. Chlorophyll-a (algae): 8.5 µg/L.
Is Fjac Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Fjac Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Fjac Lake?
- No published bathymetric survey covers Fjac Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 35 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Fjac Lake across LakeQuality
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Where this data comes from
136 measurements from 1 monitoring station, 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
21AWIC136 samples · 2012–2024
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
Lake size & watershed from HydroLAKES (HydroSHEDS)