Isabell Lake
Polk County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Isabell Lake. Here is what has been measured.
- Impaired · pH / acidity
- Limited data
Isabell Lake in Polk County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 4.1 ft visibility. Phosphorus: 22.5 µg/L.
Isabell Lake is a lake in Polk County, Florida. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2020-09-22. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Isabell Lake is listed impaired under Clean Water Act §303(d) (IR 4C) for pH / acidity. Check local advisories before you swim.
Whether Isabell Lake is safe to swim in today is a call for the Florida Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Isabell Lake
These are the measurements Florida DEP publishes for Isabell Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4.1 ft. Phosphorus 22.5 µg/L. TSI 53.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 22.5µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 53 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Isabell Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Isabell Lake typically sits around 79°F at the surface in October. Summer average is about 86°F. Usually warmest in Jul (about 86°F) and coldest in Feb (about 67°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (67°F) to its warmest (86°F).
Typical surface water temperature by month, from 76 field readings (2011–2022) via the EPA Water Quality Portal. See the full Isabell Lake water temperature breakdown →
Stays via Stay22
Stays near Isabell Lake
Compare lakeside cabins, hotels, and vacation rentals near Isabell Lake in Polk 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 Isabell Lake
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Florida’s top lakes →
Follow Isabell Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Isabell Lake
Water Quality Trend: Improving
Based on 4 years of monitoring (2020–2023).
Water clarity
Stable4 years
Phosphorus
Improving-1.75 µg/L/yr4 years
EPA Impairment Status
Isabell Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4C).
Causes of impairment
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit FL1758F · Official waterbody report
Nearby Lakes in Polk County
Frequently asked questions about Isabell Lake
Where is Isabell Lake?
- Isabell Lake is a lake in Polk County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Isabell Lake?
- Isabell Lake in Polk County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 4.1 ft visibility. Phosphorus: 22.5 µg/L.
Is Isabell Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Isabell Lake is listed impaired under Clean Water Act §303(d) (IR 4C) for pH / acidity. Check local advisories before you swim.
What is the water temperature of Isabell Lake?
- Isabell Lake typically sits around 79°F at the surface in October, from 76 EPA Water Quality Portal field readings (2011–2022). That is a typical value for the month, not a live reading.
Explore Isabell Lake across LakeQuality
More lakes in Florida
Other Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
6 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples6 samples · 2020
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database