Horseshoenwsh Lake
Horseshoenwsh Lake in Lake County, Florida has a water quality grade of C (Fair). Water clarity: 2.6 ft visibility. Phosphorus: 53.4 µg/L.
- Clarity
- 2.6 ft
- Typical in July
- 91°F
- Type
- Eutrophic
- Trend
- → Stable
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Horseshoenwsh Lake is a productive, nutrient-rich eutrophic lake in Lake County, Florida. Water quality is graded C based on 1 sampling years through 2025. Water clarity is improving over recent sampling years. Compared to the 127 other monitored lakes in Lake County, Horseshoenwsh Lake ranks #114 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-07-30. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyBacteria A
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.
Based on E. coli testing, Horseshoenwsh Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 15 samples across 2 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Florida’s current beach and health-department advisories before swimming.
Water Quality Grade: C (Fair)
Very murky, less than 2.6 ft of visibility. Phosphorus level: 53.4 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.6 ft | Not graded |
| Phosphorus | 53.4 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Horseshoenwsh Lake
Compare lakeside cabins, hotels, and vacation rentals near Horseshoenwsh Lake in Lake 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 Horseshoenwsh Lake
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Water Temperature
Horseshoenwsh Lake typically sits around 91°F at the surface in July. Summer average is about 90°F. Usually warmest in Jul (about 91°F) and coldest in Feb (about 69°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 17 field readings (2024–2025) via the EPA Water Quality Portal. See the full Horseshoenwsh Lake water temperature breakdown →
Fishing Horseshoenwsh Lake
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.018 m/yr | 6 |
| Phosphorus | ↓ Declining | +0.77 µg/L/yr | 6 |
EPA Impairment Status
Horseshoenwsh Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit FL2837A · Official waterbody report · Matched by proximity (0.51 km)
County Ranking
Ranked #114 of 128 lakes in Lake County
Nearby Lakes With Higher Grades
Horseshoenwsh Lake holds Grade C. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Lake County
Frequently asked questions about Horseshoenwsh Lake
Where is Horseshoenwsh Lake?
- Horseshoenwsh Lake is a lake in Lake County, Florida. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Horseshoenwsh Lake?
- Horseshoenwsh Lake in Lake County, Florida has a water quality grade of C (Fair). Water clarity: 2.6 ft visibility. Phosphorus: 53.4 µg/L.
Is Horseshoenwsh Lake safe to swim in?
- Based on E. coli testing, Horseshoenwsh Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 15 samples across 2 seasons. That works out to a bacteria swim-safety grade of A — a historical summary of past testing, not a current reading. Horseshoenwsh Lake has a water quality grade of C (Fair). Bacteria levels can spike quickly after heavy rain, so always check Florida's current beach and health-department advisories before you swim.
What is the water temperature of Horseshoenwsh Lake?
- Horseshoenwsh Lake typically sits around 91°F at the surface in July, from 17 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
Explore Horseshoenwsh Lake across LakeQuality
More Florida Lake Rankings
Other Grade C Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
36 measurements from 1 monitoring station, 2024–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples36 samples · 2024–2025
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database