Lake Powell Bay County Line
Lake Powell Bay County Line in Walton County, Florida has a water quality grade of B (Good). Water clarity: 4.5 ft visibility. Phosphorus: 14 µg/L.
- Clarity
- 4.5 ft
- Typical in August
- 88°F
- Type
- Mesotrophic
- Trend
- ↑ Improving
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Lake Powell Bay County Line is a mesotrophic lake in Walton County, Florida. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is improving over recent sampling years. Compared to the 83 other monitored lakes in Walton County, Lake Powell Bay County Line ranks #24 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-02-12. Grade methodology: LakeQuality methodology.
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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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Murky, only visible to about 4.5 ft. Phosphorus level: 14 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.5 ft | Not graded |
| Phosphorus | 14 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lake Powell Bay County Line
Compare lakeside cabins, hotels, and vacation rentals near Lake Powell Bay County Line in Walton County, Florida — 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.
Top-rated places to stay near Lake Powell Bay County Line
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Water Temperature
Lake Powell Bay County Line typically sits around 88°F at the surface in August. Summer average is about 86°F. Usually warmest in Aug (about 88°F) and coldest in Jan (about 59°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 327 field readings (2010–2025) via the EPA Water Quality Portal. See the full Lake Powell Bay County Line water temperature breakdown →
Fishing Lake Powell Bay County Line
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.11 m/yr | 5 |
| Phosphorus | → Stable | +0.05 µg/L/yr | 5 |
EPA Impairment Status
Lake Powell Bay County Line is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL1055A · Official waterbody report · Matched by proximity (1.69 km)
County Ranking
Ranked #24 of 84 lakes in Walton County
Nearby Lakes in Walton County
Frequently asked questions about Lake Powell Bay County Line
Where is Lake Powell Bay County Line?
- Lake Powell Bay County Line is a lake in Walton County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Powell Bay County Line?
- Lake Powell Bay County Line in Walton County, Florida has a water quality grade of B (Good). Water clarity: 4.5 ft visibility. Phosphorus: 14 µg/L.
Is Lake Powell Bay County Line safe to swim in?
- Good for swimming, clear water with low algae levels. Lake Powell Bay County Line has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Lake Powell Bay County Line?
- Lake Powell Bay County Line typically sits around 88°F at the surface in August, from 327 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Explore Lake Powell Bay County Line across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Mesotrophic Lakes in Florida
Where this data comes from
108 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- CHOCTAWHATCHEE BASIN ALLIANCE
21FLCBA_WQX108 samples · 2020–2025
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