Polk-Fannie Lake
Polk County, FloridaEutrophic
Polk-Fannie Lake is a productive, nutrient-rich eutrophic lake in Polk County, Florida. Water quality is graded C based on 2 sampling years through 2025. Compared to the 360 other monitored lakes in Polk County, Polk-Fannie Lake ranks #108 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-03-31. Grade methodology: LakeGrade methodology.
Watch Polk-Fannie Lake water quality
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 3.5 ft. Phosphorus level: 28 µg/L. Trophic State Index: 56.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.5 ft | D |
| Phosphorus | 28 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #108 of 361 lakes in Polk County
Nearby Lakes in Polk County
More Florida Lake Rankings
Other Grade C Lakes in Florida
Orange County · Clarity: 3.5 ft
Walton County · Clarity: 4.2 ft
Seminole County · Clarity: 4.5 ft
Seminole County · Clarity: 2.9 ft
Volusia County · Clarity: 4.5 ft
Seminole County · Clarity: 3 ft
Eutrophic Lakes in Florida
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-03-31
Monitoring stations: 3
Where to stay near Polk-Fannie Lake
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