Union County, Tennessee · Water Quality Report Card
Powell River Embayment of Norris Reservoir
Powell River Embayment of Norris Reservoir in Union County, Tennessee is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 10 µg/L.
- Mean depth
- ~118 ft est.
- Type
- Oligotrophic
Powell River Embayment of Norris Reservoir is a cold, clear oligotrophic lake in Union County, Tennessee with an estimated average depth of about 118 feet.
Source: EPA Water Quality Portal sampling records, TDEC, last sampled 2022-07-05. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not rated for swimming — there is not enough monitoring data to judge this lake
Water Quality Grade: Not rated
No clarity data. Phosphorus level: 10 µg/L. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 10 µg/L | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~118 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Tennessee has not published bathymetry for Powell River Embayment of Norris Reservoir.
Where to stay near Powell River Embayment of Norris Reservoir
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Fishing Powell River Embayment of Norris Reservoir
Location
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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.
Where this data comes from
1 measurement from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- TDEC Division of Water Resources
TDECWR_WQX1 sample · 2022
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (1)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2022-07-05
Monitoring stations: 1