Sinl Lake
Lawrence County, AlabamaView mapDirections
ADEM publishes the water-quality measurements for Sinl Lake. Here is what has been measured.
- Oligotrophic
- 34 ft max depth
- Limited data
Sinl Lake in Lawrence County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 14.5 ft visibility. Phosphorus: 13.5 µg/L. Chlorophyll-a (algae): 1.7 µg/L.
Sinl Lake is a cold, clear oligotrophic lake in Lawrence County, Alabama with an estimated average depth of about 34 feet. Compared to the 1 other monitored lakes in Lawrence County, Sinl Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, ADEM, last sampled 2023-10-18. Methodology: how these readings are compared.
What Sinl Lake is good for
From access and monitoring records, not editorial picks.
- Clear water14.5 ft of visibility
Swimming conditions
Readings onlyLimited data
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 Sinl 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 Sinl Lake
These are the measurements ADEM publishes for Sinl 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 14.5 ft. Phosphorus 13.5 µg/L. Chlorophyll-a 1.7 µg/L. TSI 39.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 14.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 13.5µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 1.7µg/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 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Sinl Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~34 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 Sinl Lake.
Lake Size & Watershed
Watershed (drainage) area
4 sq mi
HydroLAKES / HydroSHEDS
Surface area
94 acres
HydroLAKES / HydroSHEDS
Shoreline
3.4 mi
HydroLAKES / HydroSHEDS
Elevation
692 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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Stays near Sinl Lake
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Fishing Sinl Lake
Nearby Lakes in Lawrence County
Frequently asked questions about Sinl Lake
Where is Sinl Lake?
- Sinl Lake is a lake in Lawrence County, Alabama. Its water-quality measurements are published by ADEM and shown on this page as reported.
What is the water quality of Sinl Lake?
- Sinl Lake in Lawrence County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 14.5 ft visibility. Phosphorus: 13.5 µg/L. Chlorophyll-a (algae): 1.7 µg/L.
Is Sinl Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Sinl Lake?
- No published bathymetric survey covers Sinl Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 34 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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Where this data comes from
28 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- ALABAMA DEPT. OF ENVIRONMENTAL MANAGEMENT - WATER QUALITY DATA
21AWIC28 samples · 2023
Analytical methods
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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
Lake size & watershed from HydroLAKES (HydroSHEDS)