Eastern Rock Lake
Eastern Rock Lake in Lee County, Florida has a water quality grade of C (Fair). Phosphorus: 47 µg/L.
- Type
- Eutrophic
- Trend
- ↑ Improving
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Eastern Rock Lake is a productive, nutrient-rich eutrophic lake in Lee County, Florida. Water quality is graded C based on 1 sampling years through 2022. Overall water quality is improving over recent sampling years. Compared to the 73 other monitored lakes in Lee County, Eastern Rock Lake ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2022-07-13. Grade methodology: LakeQuality methodology.
Watch Eastern Rock Lake water quality
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Swimming Safety
Grade onlyLimited data
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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
No clarity data. Phosphorus level: 47 µg/L. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 47 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Eastern Rock Lake
Compare lakeside cabins, hotels, and vacation rentals near Eastern Rock Lake in Lee 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.
Top-rated places to stay near Eastern Rock Lake
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Fishing Eastern Rock Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -50.5 µg/L/yr | 2 |
EPA Impairment Status
Eastern Rock Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL2092F1 · Official waterbody report · Matched by proximity (0.15 km)
County Ranking
Ranked #11 of 74 lakes in Lee County
Nearby Lakes in Lee County
Frequently asked questions about Eastern Rock Lake
Where is Eastern Rock Lake?
- Eastern Rock Lake is a lake in Lee County, Florida. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Eastern Rock Lake?
- Eastern Rock Lake in Lee County, Florida has a water quality grade of C (Fair). Phosphorus: 47 µg/L.
Is Eastern Rock Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Eastern Rock Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
Explore Eastern Rock Lake across LakeQuality
More Florida Lake Rankings
Other Grade C Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
4 measurements from 1 monitoring station, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples4 samples · 2020–2022
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database