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F

Lake Mid

St. Johns County, FloridaEutrophic

Lake Mid is a productive, nutrient-rich eutrophic lake in St. Johns County, Florida. Water quality is graded F based on 2 sampling years through 2024. Compared to the 7 other monitored lakes in St. Johns County, Lake Mid ranks #5 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2024-11-14. 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 2.1 ft of visibility. Phosphorus level: 103.5 µg/L. Trophic State Index: 69.

MetricValueGrade
Water Clarity (Secchi Depth)2.1 ftF
Phosphorus103.5 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)69Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #5 of 8 lakes in St. Johns County

Cleaner Lakes Within 30 Miles

Lake Mid holds Grade F. 2 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in St. Johns County

D
Lake South
St. Johns County
F
Micklers Lake
St. Johns County
F
Lake Vedra
St. Johns County
C
Duval-Willow Lake
Duval County
C
Duv-Queensharlag Lake
Duval County
B
Duval-Hidden Lake
Duval County

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 F Lakes in Florida

Polk-Little Bass Lake

Polk County · Clarity: 1.3 ft

Polk-Big Bass Lake

Polk County · Clarity: 1 ft

Alachua-Wauberg Lake

Alachua County · Clarity: 2.4 ft

Lake Roberta

Hillsborough County · Clarity: 1.3 ft

Volusia Lake George @ N of Center

Volusia County · Clarity: 2 ft

Lwc Lake

Brevard County · Clarity: 1.6 ft

Eutrophic Lakes in Florida

Lake Lancaster WestFlagler-Emerald LakeEastern Lake OutletSeminole-Secret Lake

Lake Size & Watershed

Watershed (drainage) area
1 sq mi
Surface area
902 acres
Mean depth (est.)
13.5 ft
Shoreline
11.5 mi
Elevation
-3 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: 2024-11-14

Monitoring stations: 1

Where to stay near Lake Mid

Compare lakeside cabins, hotels, and vacation rentals near Lake Mid in St. Johns County, Florida — live availability and prices for your trip.

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