B

Clay-Johnson Lake

Clay County, FloridaMesotrophic

Clay-Johnson Lake is a mesotrophic lake in Clay County, Florida. Water quality is graded B based on 2 sampling years through 2025. Compared to the 24 other monitored lakes in Clay County, Clay-Johnson Lake ranks #10 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-04-09. Grade methodology: LakeGrade methodology.

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Murky, only visible to about 6 ft. Phosphorus level: 12 µg/L. Trophic State Index: 46.

Metric	Value	Grade
Water Clarity (Secchi Depth)	6 ft	C
Phosphorus	12 µg/L	A
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	46	Mesotrophic

Moderate nutrients, good water quality

Location

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County Ranking

Ranked #10 of 25 lakes in Clay County

Cleaner Lakes Within 30 Miles

Clay-Johnson Lake holds Grade B. 3 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Clay County

Clay-Little Johnson Lake

Clay-Sheelar Lake

Smith Lake Center

George'S Lake @ Center Hab

More Florida Lake Rankings

Cleanest lakes in Florida

Top 25 by overall water quality score

Best swimming lakes in Florida

Grade A/B + low algae filter

Family fishing lakes in Florida

Panfish-rich, public access

All Florida lakes

Full state directory

Other Grade B Lakes in Florida

Bay-Deer Point Lake

Bay County · Clarity: 4 ft

Brevard-Clear Lake

Brevard County · Clarity: 9.8 ft

Alachua-Santa Fe Painter Canal Lake

Alachua County · Clarity: 5.5 ft

Seminole-Little Howell Lake

Seminole County · Clarity: 5 ft

Marion-Deerback Lake

Marion County · Clarity: 7 ft

Hillsborough-Flynn Lake

Hillsborough County · Clarity: 6 ft

Mesotrophic Lakes in Florida

Bay-Deer Point Lake Brevard-Clear Lake Marion-Deerback Lake Hillsborough-Flynn Lake

Lake Size & Watershed

Watershed (drainage) area

6 sq mi

Surface area

67 acres

Mean depth (est.)

9.8 ft

Shoreline

1.6 mi

Elevation

92 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: 2025-04-09

Monitoring stations: 3

Where to stay near Clay-Johnson Lake

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