Danw Lake
Dallas County, AlabamaView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↑ up from C at the last regrade
- Eutrophic
- #1 of 2 in the county
- 87 ft max depth
- Public access
Danw Lake in Dallas County, Alabama has a water quality grade of B (Good). Water clarity: 3.1 ft visibility. Phosphorus: 31 µg/L. Chlorophyll-a (algae): 7.1 µg/L.
- Clarity
- 3.1 ft
- Max depth
- ~87 ft est.
- Type
- Eutrophic
- Phosphorus
- 31 µg/L
- Chlorophyll-a
- 7.1 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Danw Lake’s letter
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Danw Lake is a productive, nutrient-rich eutrophic lake in Dallas County, Alabama with an estimated average depth of about 87 feet. Water quality is graded B based on 1 sampling years through 2026. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 1 other monitored lakes in Dallas County, Danw Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, ADEM, last sampled 2026-04-22. 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. Check local advisories before you swim.
Water Quality Grade: B (Good)
Very murky, less than 3.1 ft of visibility. Phosphorus 31 µg/L. Chlorophyll-a 7.1 µg/L. TSI 55. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.1 ft | Not graded |
| Phosphorus | 31 µg/L | Not graded |
| Chlorophyll-a (Algae) | 7.1 µg/L | Good |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~87 ft est. |
| Average Depth | ~12 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Alabama has not published bathymetry for Danw 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 Danw Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.02 m/yr | 5 |
| Phosphorus | → Stable | -0.47 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +0.26 µg/L/yr | 5 |
Reservoir Info (USACE NID)
Danw Lake is a man-made reservoir impounded by the Hammermill Waste Treatment Dam (completed 1974), built primarily for other on the Tr-Alabama River; earth-type dam, 18 ft tall and 8,600 ft long.
- Normal storage
- 1,344 ac-ft
- Max storage
- 1,536 ac-ft
- Hazard class
- Low
- Owner
- HAMMERMILL PAPER CO INC
Source: USACE National Inventory of Dams, NID ID AL01606 · Operator website · Matched by proximity (0.51 km)
County Ranking
Ranked #1 of 2 lakes in Dallas County
Nearby Lakes in Dallas County
Frequently asked questions about Danw Lake
Where is Danw Lake?
- Danw Lake is a lake in Dallas County, Alabama. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Danw Lake?
- Danw Lake in Dallas County, Alabama has a water quality grade of B (Good). Water clarity: 3.1 ft visibility. Phosphorus: 31 µg/L. Chlorophyll-a (algae): 7.1 µg/L.
Is Danw Lake safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Danw Lake?
- No published bathymetric survey covers Danw Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 87 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Danw Lake across LakeQuality
More Alabama Lake Rankings
Other Grade B Lakes in Alabama
Where this data comes from
138 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
21AWIC138 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)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)