Duck River Lake
Humphreys County, TennesseeView mapDirections
Nutrients and algae run above the regional average.
↑ up from F at the last regrade
- Hypereutrophic
- #1 of 1 in the county
Duck River Lake in Humphreys County, Tennessee has a water quality grade of D (Nutrient-rich). Phosphorus: 200 µg/L.
- Type
- Hypereutrophic
- Phosphorus
- 200 µg/L
Stays via Stay22
Stays near Duck River Lake
Compare lakeside cabins, hotels, and vacation rentals near Duck River Lake in Humphreys County, Tennessee — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Duck River Lake are listed below.
Top-rated places to stay near Duck River Lake
Prices for Sep 11–13, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Tennessee’s top lakes →
Watch Duck River Lake’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
Duck River Lake is a highly nutrient-loaded hypereutrophic lake in Humphreys County, Tennessee. Water quality is graded D based on 1 sampling years through 2024.
Source: EPA Water Quality Portal sampling records, TDEC, last sampled 2024-06-06. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyElevated nutrients
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 D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus 200 µg/L. TSI 81. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 200 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 81 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Fishing Duck River Lake
County Ranking
Ranked #1 of 1 lakes in Humphreys County
Nearby Lakes in Humphreys County
Frequently asked questions about Duck River Lake
Where is Duck River Lake?
- Duck River Lake is a lake in Humphreys County, Tennessee. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Duck River Lake?
- Duck River Lake in Humphreys County, Tennessee has a water quality grade of D (Nutrient-rich). Phosphorus: 200 µg/L.
Is Duck River Lake safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Duck River Lake across LakeQuality
Species activity outlook by water temperature and season
Where to stay at Tennessee's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
Tennessee's cleanest and most-polluted lakes, ranked
More Tennessee Lake Rankings
Other Grade D Lakes in Tennessee
Hypereutrophic Lakes in Tennessee
Where this data comes from
33 measurements from 2 monitoring stations, 2012–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- TDEC Division of Water Resources
TDECWR_WQX33 samples · 2012–2024
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 4500 P H ~ Manual Digestion and Flow Injection Analysis for Total Phosphorus
- Phosphorus by Colorimetry
Monitoring station identifiers (2)
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.