Fjac Lake
Covington County, AlabamaView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
- Eutrophic
- Impaired · Mercury
- #2 of 3 in the county
- 35 ft max depth
Fjac Lake in Covington County, Alabama has a water quality grade of B (Good). Water clarity: 3.9 ft visibility. Phosphorus: 14 µg/L. Chlorophyll-a (algae): 8.5 µg/L.
- Clarity
- 3.9 ft
- Max depth
- ~35 ft est.
- Type
- Eutrophic
- Phosphorus
- 14 µg/L
- Chlorophyll-a
- 8.5 µg/L
- Trend
- ↑ Improving
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Watch Fjac Lake’s letter
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Fjac Lake is a productive, nutrient-rich eutrophic lake in Covington County, Alabama with an estimated average depth of about 35 feet. Water quality is graded B based on 2 sampling years through 2024. 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. Grade methodology: LakeQuality methodology.
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 B is nutrients and algae, 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.
Water Quality Grade: B (Good)
Murky, only visible to about 3.9 ft. Phosphorus 14 µg/L. Chlorophyll-a 8.5 µg/L. TSI 50. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.9 ft | Not graded |
| Phosphorus | 14 µg/L | Good |
| Chlorophyll-a (Algae) | 8.5 µg/L | Good |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~35 ft est. |
| Average Depth | ~24 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
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.
Fishing Fjac Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.023 m/yr | 5 |
| Phosphorus | ↑ Improving | -0.4 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.25 µg/L/yr | 5 |
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
Source: EPA ATTAINS assessment unit AL03140103-0102-102 · Official waterbody report · Matched by proximity (2.3 km)
County Ranking
Ranked #2 of 3 lakes in Covington County
Nearby Lakes in Covington County
Frequently asked questions about Fjac Lake
Where is Fjac Lake?
- Fjac Lake is a lake in Covington County, Alabama. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Fjac Lake?
- Fjac Lake in Covington County, Alabama has a water quality grade of B (Good). Water clarity: 3.9 ft visibility. Phosphorus: 14 µg/L. Chlorophyll-a (algae): 8.5 µg/L.
Is Fjac Lake safe to swim in?
- The B is nutrients and algae, 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
More Alabama Lake Rankings
Other Grade B Lakes in Alabama
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)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)