Portland Lake
Sumner County, Tennessee24 acresView mapDirections
TDEC publishes the water-quality measurements for Portland Lake. Here is what has been measured.
- Limited data
Portland Lake in Sumner County, Tennessee has water-quality measurements published by TDEC, shown here as reported. Phosphorus: 67.9 µg/L. Surface area: 24 acres.
Portland Lake is a 24-acre lake in Sumner County, Tennessee.
Source: EPA Water Quality Portal sampling records, TDEC, last sampled 2025-06-10. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Portland Lake is safe to swim in today is a call for the Tennessee Department of Environment and Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Portland Lake
These are the measurements TDEC publishes for Portland Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 67.9 µg/L. TSI 65.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 67.9µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 65 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Portland Lake
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Lake Details
Surface area
24 acres
No bathymetric survey has been published for Portland Lake, so its depth is not documented here.
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Stays near Portland Lake
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Fishing Portland Lake
Reservoir Info (USACE NID)
Portland Lake is a man-made reservoir impounded by the Portland City Lake Dam (completed 1945) on the Trib-W Fork Drakes Creek; earth-type dam, 34 ft tall and 614 ft long.
- Surface area
- 24 ac
- Normal storage
- 272 ac-ft
- Max storage
- 422 ac-ft
- Drainage area
- 1.06 sq mi
- Hazard class
- Significant
- Owner
- City Of Portland
Source: USACE National Inventory of Dams, NID ID TN16510 · Operator website · Matched by proximity (0.02 km)
Nearby Lakes in Sumner County
Frequently asked questions about Portland Lake
Where is Portland Lake?
- Portland Lake is a lake in Sumner County, Tennessee. Its water-quality measurements are published by TDEC and shown on this page as reported.
What is the water quality of Portland Lake?
- Portland Lake in Sumner County, Tennessee has water-quality measurements published by TDEC, shown here as reported. Phosphorus: 67.9 µg/L. Surface area: 24 acres.
Is Portland Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
18 measurements from 1 monitoring station, 2024–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- TDEC Division of Water Resources
TDECWR_WQX18 samples · 2024–2025
Analytical methods
- Phosphorus by Colorimetry
- Turbidity by Nephelometry
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.