B

Lake Weir

Marion County, FloridaMesotrophic

Lake Weir is a mesotrophic lake in Marion County, Florida. Water quality is graded B based on 2 sampling years through 2025. Compared to the 41 other monitored lakes in Marion County, Lake Weir ranks #20 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-05-28. 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 4.9 ft. Phosphorus level: 14.5 µg/L. Trophic State Index: 48.

Metric	Value	Grade
Water Clarity (Secchi Depth)	4.9 ft	D
Phosphorus	14.5 µg/L	A
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	48	Mesotrophic

Moderate nutrients, good water quality

Location

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County Ranking

Ranked #20 of 42 lakes in Marion County

Cleaner Lakes Within 30 Miles

Lake Weir holds Grade B. 4 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Marion County

Marion-Weir Lake

Lake Weir @ Boat Ramp

Lake Weir @ Ne Shore

Marion-Sunset Harbor 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 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

Hillsborough-Flynn Lake

Hillsborough County · Clarity: 6 ft

Western Lake Middle

Walton County · Clarity: 4 ft

Mesotrophic Lakes in Florida

Bay-Deer Point Lake Brevard-Clear Lake Hillsborough-Flynn Lake Western Lake Middle

Lake Size & Watershed

Watershed (drainage) area

37 sq mi

Surface area

5,414 acres

Mean depth (est.)

16.4 ft

Shoreline

15.8 mi

Elevation

62 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: 2025-05-28

Monitoring stations: 9

Where to stay near Lake Weir

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