F

Bonnet-Col Lake

Polk County, FloridaHypereutrophic

Bonnet-Col Lake is a highly nutrient-loaded hypereutrophic lake in Polk County, Florida. Water quality is graded F based on 2 sampling years through 2025. Compared to the 360 other monitored lakes in Polk County, Bonnet-Col Lake ranks #310 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-09-03. Grade methodology: LakeGrade methodology.

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Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 0.8 ft of visibility. Phosphorus level: 223 µg/L. Trophic State Index: 81.

Metric	Value	Grade
Water Clarity (Secchi Depth)	0.8 ft	F
Phosphorus	223 µg/L	F
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	81	Hypereutrophic

Very high nutrients, dense algae, poor clarity

Location

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County Ranking

Ranked #310 of 361 lakes in Polk County

Cleaner Lakes Within 30 Miles

Bonnet-Col Lake holds Grade F. 3 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Polk County

Beulah-Col Lake

Mirror-Col Lake

More Florida Lake Rankings

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Top 25 by overall water quality score

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Grade A/B + low algae filter

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Panfish-rich, public access

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Other Grade F Lakes in Florida

Alachua-Wauberg Lake

Alachua County · Clarity: 2.4 ft

Hillsborough County · Clarity: 1.3 ft

Volusia Lake George @ N of Center

Volusia County · Clarity: 2 ft

Brevard County · Clarity: 1.6 ft

Highlands-Wolf Lake

Highlands County · Clarity: 1 ft

Glades County · Clarity: 1 ft

Hypereutrophic Lakes in Florida

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Lake Size & Watershed

Watershed (drainage) area

2 sq mi

Surface area

69 acres

Mean depth (est.)

12.1 ft

Shoreline

1.2 mi

Elevation

144 ft

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: 2025-09-03

Monitoring stations: 1

Where to stay near Bonnet-Col Lake

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