Lake Isabell Sw
Lake Isabell Sw in Polk County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2 ft visibility. Phosphorus: 21 µg/L.
- Clarity
- 2 ft
- Typical in June
- 84°F
- Trend
- ↑ Improving
Next lake in Polk County
Swipe left or right on this bar to open the next or previous lake.
Why Lake Isabell Sw has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lake Isabell Sw, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and phosphorus, but not algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by FDEP and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Isabell Sw is a lake in Polk County, Florida. Overall water quality is improving over recent sampling years. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2020-09-10. Grade methodology: LakeQuality methodology.
Watch Lake Isabell Sw water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lake Isabell Sw
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2 ft of visibility. Phosphorus level: 21 µg/L. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | Not graded |
| Phosphorus | 21 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Isabell Sw
Compare lakeside cabins, hotels, and vacation rentals near Lake Isabell Sw 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 Lake Isabell Sw
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 →
Water Temperature
Lake Isabell Sw typically sits around 84°F at the surface in June. Summer average is about 84°F. Usually warmest in Jun (about 84°F) and coldest in Feb (about 61°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 24 field readings (2016–2020) via the EPA Water Quality Portal. See the full Lake Isabell Sw water temperature breakdown →
Recreation & Access
- Lake IsabellSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Isabell Sw
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.005 m/yr | 4 |
| Phosphorus | ↑ Improving | -1.75 µg/L/yr | 4 |
EPA Impairment Status
Lake Isabell Sw is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4C).
Causes of impairment
Source: EPA ATTAINS assessment unit FL1758F · Official waterbody report · Matched by proximity (0.22 km)
Graded lakes near Lake Isabell Sw
Lake Isabell Sw has no grade, but these lakes within a short drive do.
Nearby Lakes in Polk County
Frequently asked questions about Lake Isabell Sw
Where is Lake Isabell Sw?
- Lake Isabell Sw is a lake in Polk County, Florida. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Lake Isabell Sw?
- Lake Isabell Sw in Polk County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2 ft visibility. Phosphorus: 21 µg/L.
Is Lake Isabell Sw safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Isabell Sw is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
What is the water temperature of Lake Isabell Sw?
- Lake Isabell Sw typically sits around 84°F at the surface in June, from 24 EPA Water Quality Portal field readings (2016–2020). That is a typical value for the month, not a live reading.
Are there boat ramps on Lake Isabell Sw?
- Lake Isabell Sw has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Isabell.
Explore Lake Isabell Sw across LakeQuality
More Florida Lake Rankings
Other Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
2 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 samples2 samples · 2020
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
Named boat-access points from the USGS National Boat Ramps inventory