Eastshore Lake
Eastshore Lake in Martin County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 1 ft visibility. Phosphorus: 124 µg/L.
- Clarity
- 1 ft
- Typical in August
- 87°F
- Type
- Hypereutrophic
- Trend
- ↓ Declining
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Eastshore Lake →
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Eastshore Lake is a highly nutrient-loaded hypereutrophic lake in Martin County, Florida. Water quality is graded D based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. Compared to the 4 other monitored lakes in Martin County, Eastshore Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-08-05. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyElevated nutrients
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 1 ft of visibility. Phosphorus level: 124 µg/L. Trophic State Index: 76.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 ft | Not graded |
| Phosphorus | 124 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 76 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Eastshore Lake
Compare lakeside cabins, hotels, and vacation rentals near Eastshore Lake in Martin County, Florida — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Eastshore Lake are listed below.
Top-rated places to stay near Eastshore Lake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Eastshore Lake typically sits around 87°F at the surface in August. Summer average is about 87°F. Usually warmest in Jul (about 88°F) and coldest in Jan (about 66°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 99 field readings (2020–2025) via the EPA Water Quality Portal. See the full Eastshore Lake water temperature breakdown →
Fishing Eastshore Lake
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | 0 m/yr | 6 |
| Phosphorus | ↓ Declining | +3.8 µg/L/yr | 6 |
County Ranking
Ranked #5 of 5 lakes in Martin County
Nearby Lakes in Martin County
Frequently asked questions about Eastshore Lake
Where is Eastshore Lake?
- Eastshore Lake is a lake in Martin County, Florida. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Eastshore Lake?
- Eastshore Lake in Martin County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 1 ft visibility. Phosphorus: 124 µg/L.
Is Eastshore Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Eastshore Lake has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
What is the water temperature of Eastshore Lake?
- Eastshore Lake typically sits around 87°F at the surface in August, from 99 EPA Water Quality Portal field readings (2020–2025). That is a typical value for the month, not a live reading.
Explore Eastshore Lake across LakeQuality
More Florida Lake Rankings
Other Grade D Lakes in Florida
Hypereutrophic Lakes in Florida
Where this data comes from
197 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples197 samples · 2020–2025
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.