Gertrude Se Sh Lake
Gertrude Se Sh Lake in Lake County, Florida has a water quality grade of B (Good). Water clarity: 5.9 ft visibility. Phosphorus: 18 µg/L.
- Clarity
- 5.9 ft
- Typical in August
- 86°F
- Max depth
- ~47 ft est.
- Type
- Mesotrophic
- Trend
- → Stable
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Gertrude Se Sh Lake is a mesotrophic lake in Lake County, Florida with an estimated average depth of about 47 feet. Water quality is graded B based on 1 sampling years through 2025. Water clarity is declining over recent sampling years. Compared to the 127 other monitored lakes in Lake County, Gertrude Se Sh Lake ranks #75 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-04-23. 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, Gertrude Se Sh Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 15 samples across 6 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: B (Good)
Murky, only visible to about 5.9 ft. Phosphorus level: 18 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.9 ft | Not graded |
| Phosphorus | 18 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Gertrude Se Sh Lake
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Water Temperature
Gertrude Se Sh Lake typically sits around 86°F at the surface in August. Summer average is about 85°F. Usually warmest in Jul (about 86°F) and coldest in Jan (about 60°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 95 field readings (2010–2025) via the EPA Water Quality Portal. See the full Gertrude Se Sh Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~47 ft est. |
| Average Depth | ~14 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Florida has not published bathymetry for Gertrude Se Sh Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Gertrude Se Sh Lake
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.37 m/yr | 5 |
| Phosphorus | ↑ Improving | -3.7 µg/L/yr | 5 |
County Ranking
Ranked #75 of 128 lakes in Lake County
Nearby Lakes in Lake County
Frequently asked questions about Gertrude Se Sh Lake
Where is Gertrude Se Sh Lake?
- Gertrude Se Sh Lake is a lake in Lake County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Gertrude Se Sh Lake?
- Gertrude Se Sh Lake in Lake County, Florida has a water quality grade of B (Good). Water clarity: 5.9 ft visibility. Phosphorus: 18 µg/L.
Is Gertrude Se Sh Lake safe to swim in?
- Based on E. coli testing, Gertrude Se Sh Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 15 samples across 6 seasons. That works out to a bacteria swim-safety grade of A — a historical summary of past testing, not a current reading. Gertrude Se Sh Lake has a water quality grade of B (Good). 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 Gertrude Se Sh Lake?
- Gertrude Se Sh Lake typically sits around 86°F at the surface in August, from 95 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
How deep is Gertrude Se Sh Lake?
- No published bathymetric survey covers Gertrude Se Sh Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 47 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Gertrude Se Sh Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Mesotrophic Lakes in Florida
Where this data comes from
25 measurements from 1 monitoring station, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples25 samples · 2021–2025
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
Lake size & watershed from HydroLAKES (HydroSHEDS)