Portland Lake
Sumner County, Tennessee24 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Impaired · Nutrients (phosphorus, nitrogen)
- Limited data
Portland Lake in Sumner County, Tennessee is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 67.9 µg/L. Surface area: 24 acres.
- Area
- 24 acres
- Phosphorus
- 67.9 µg/L
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Stays near Portland Lake
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Watch Portland Lake’s letter
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Why Portland Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Portland Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by TDEC and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Portland Lake is a 24-acre lake in Sumner County, Tennessee.
Source: EPA Water Quality Portal sampling records, TDEC, last sampled 2025-06-10. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Portland Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO), sediment / turbidity, taste, color, odor. Check local advisories before you swim.
Water quality measurements for Portland Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 67.9 µg/L. TSI 65.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 67.9 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 24 acres |
No bathymetric survey has been published for Portland Lake, so its depth is not documented here.
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)
EPA Impairment Status
Portland Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit TN05110002CITYLKPO_1000 · Official waterbody report · Matched by proximity (0.37 km)
Graded lakes near Portland Lake
Portland Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Sumner County
Frequently asked questions about Portland Lake
Where is Portland Lake?
- Portland Lake is a lake in Sumner County, Tennessee. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Portland Lake?
- Portland Lake in Sumner County, Tennessee is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 67.9 µg/L. Surface area: 24 acres.
Is Portland Lake safe to swim in?
- The letter is not a swimming clearance. Portland Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO), sediment / turbidity, taste, color, odor. Check local advisories before you swim.
Explore Portland Lake across LakeQuality
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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)
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
Impairment status from EPA ATTAINS 303(d) database