Marion-Weir Lake
Marion County, FloridaMesotrophic
Marion-Weir Lake is a mesotrophic lake in Marion County, Florida. Water quality is graded C based on 2 sampling years through 2025. Compared to the 41 other monitored lakes in Marion County, Marion-Weir Lake ranks #24 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-02-26. Grade methodology: LakeGrade methodology.
Watch Marion-Weir Lake water quality
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 4.8 ft. Phosphorus level: 15 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.8 ft | D |
| Phosphorus | 15 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Location
County Ranking
Ranked #24 of 42 lakes in Marion County
Cleaner Lakes Within 30 Miles
Marion-Weir Lake holds Grade C. 5 nearby lakes hold higher grades.
- BLake Weir @ Ne ShoreMarion County · 1.3 mi · Higher grade (C → B)
- BLake Weir @ Boat RampMarion County · 1.7 mi · Higher grade (C → B)
- BLillkweir LakeMarion County · 2.5 mi · Higher grade (C → B)
- BMarion-Sunset Harbor LakeMarion County · 2.6 mi · Higher grade (C → B)
- BClw LakeMarion County · 0.5 mi · Higher grade (C → B)
Nearby Lakes in Marion County
More Florida Lake Rankings
Other Grade C Lakes in Florida
Orange County · Clarity: 3.5 ft
Walton County · Clarity: 4.2 ft
Seminole County · Clarity: 4.5 ft
Seminole County · Clarity: 2.9 ft
Polk County · Clarity: 3.5 ft
Volusia County · Clarity: 4.5 ft
Mesotrophic Lakes in Florida
Lake Size & Watershed
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: 2025-02-26
Monitoring stations: 3
Where to stay near Marion-Weir Lake
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