Grdnlk Lake
Seminole County, FloridaEutrophic
Grdnlk Lake is a productive, nutrient-rich eutrophic lake in Seminole County, Florida. Water quality is graded D based on 2 sampling years through 2024. Compared to the 167 other monitored lakes in Seminole County, Grdnlk Lake ranks #147 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2024-10-23. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 2.6 ft of visibility. Phosphorus level: 30 µg/L. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.6 ft | F |
| Phosphorus | 30 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #147 of 168 lakes in Seminole County
Cleaner Lakes Within 30 Miles
Grdnlk Lake holds Grade D. 3 nearby lakes hold higher grades.
- BLake FlorenceSeminole County · 0.5 mi · Two grade letters higher (D → B)
- BLake Florence S of CenterSeminole County · 0.5 mi · Two grade letters higher (D → B)
- CSeminole-Bear Gully LakeSeminole County · 0.7 mi · Higher grade (D → C)
Nearby Lakes in Seminole County
More Florida Lake Rankings
Other Grade D Lakes in Florida
Eutrophic Lakes in Florida
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-10-23
Monitoring stations: 1
Where to stay near Grdnlk Lake
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