Dead Lake
Flagler County, FloridaHypereutrophic
Dead Lake is a highly nutrient-loaded hypereutrophic lake in Flagler County, Florida. Water quality is graded F based on 2 sampling years through 2025. Compared to the 12 other monitored lakes in Flagler County, Dead Lake ranks #13 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-08-06. Grade methodology: LakeGrade methodology.
Watch Dead Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1.6 ft of visibility. Phosphorus level: 240 µg/L. Trophic State Index: 77.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | F |
| Phosphorus | 240 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 77 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Location
County Ranking
Ranked #13 of 13 lakes in Flagler County
Cleaner Lakes Within 30 Miles
Dead Lake holds Grade F. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Flagler County
More Florida Lake Rankings
Other Grade F Lakes in Florida
Hypereutrophic 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: 2025-08-06
Monitoring stations: 1
Where to stay near Dead Lake
Compare lakeside cabins, hotels, and vacation rentals near Dead Lake in Flagler County, Florida — live availability and prices for your trip.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.