C

Johnslkw Lake

Lake County, FloridaEutrophic

Johnslkw Lake is a productive, nutrient-rich eutrophic lake in Lake County, Florida. Water quality is graded C based on 2 sampling years through 2025. Compared to the 316 other monitored lakes in Lake County, Johnslkw Lake ranks #204 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-06-26. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Moderate clarity, visible to about 6.8 ft. Phosphorus level: 77.5 µg/L. Trophic State Index: 58.

Metric	Value	Grade
Water Clarity (Secchi Depth)	6.8 ft	C
Phosphorus	77.5 µg/L	D
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	58	Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #204 of 317 lakes in Lake County

Cleaner Lakes Within 30 Miles

Johnslkw Lake holds Grade C. 5 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Lake County

Orange-John'S Lake

Johns Lk Nw @ Br Lake

Orange-Avalon Lake

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 C Lakes in Florida

Lake Lancaster West

Orange County · Clarity: 3.5 ft

Eastern Lake Outlet

Walton County · Clarity: 4.2 ft

Seminole-Secret Lake

Seminole County · Clarity: 4.5 ft

Seminole County · Clarity: 2.9 ft

Polk-Fannie Lake

Polk County · Clarity: 3.5 ft

Volusia-North Talmadge Lake

Volusia County · Clarity: 4.5 ft

Eutrophic Lakes in Florida

Lake Lancaster West Flagler-Emerald Lake Eastern Lake Outlet Seminole-Secret Lake

Lake Size & Watershed

Watershed (drainage) area

6 sq mi

Surface area

853 acres

Mean depth (est.)

20 ft

Shoreline

8.6 mi

Elevation

82 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: 2025-06-26

Monitoring stations: 1

Where to stay near Johnslkw Lake

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