D

Denham Lake

Lake County, FloridaHypereutrophic

Denham Lake is a highly nutrient-loaded hypereutrophic lake in Lake County, Florida. Water quality is graded D based on 2 sampling years through 2025. Compared to the 316 other monitored lakes in Lake County, Denham Lake ranks #305 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-01-29. Grade methodology: LakeGrade methodology.

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Very murky, less than 0.8 ft of visibility. Phosphorus level: 84.4 µg/L. Trophic State Index: 74.

Metric	Value	Grade
Water Clarity (Secchi Depth)	0.8 ft	F
Phosphorus	84.4 µg/L	D
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	74	Hypereutrophic

Very high nutrients, dense algae, poor clarity

Location

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County Ranking

Ranked #305 of 317 lakes in Lake County

Cleaner Lakes Within 30 Miles

Denham Lake holds Grade D. 2 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Lake County

Lake Denham @ Center of Lake

Harrislkwsh Lake

Harrisnwsh 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

All Florida lakes

Full state directory

Other Grade D Lakes in Florida

Flagler-Emerald Lake

Flagler County · Clarity: 1.8 ft

Indian River County · Clarity: 2.3 ft

Lake Orlando East

Orange County · Clarity: 2 ft

Orange County · Clarity: 3 ft

Orange County · Clarity: 2 ft

Putnam-Suggs Lake

Putnam County · Clarity: 2 ft

Hypereutrophic Lakes in Florida

Polk-Little Bass Lake Alicetst Lake Polk-Big Bass Lake Lake Roberta

Lake Size & Watershed

Watershed (drainage) area

3 sq mi

Surface area

227 acres

Mean depth (est.)

12.5 ft

Shoreline

2.2 mi

Elevation

46 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: 2025-01-29

Monitoring stations: 1

Where to stay near Denham Lake

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