Oyster Lake Causeway
Oyster Lake Causeway in Walton County, Florida has a water quality grade of C (Fair). Water clarity: 3 ft visibility. Phosphorus: 59 µg/L.
- Clarity
- 3 ft
- Typical in August
- 88°F
- Type
- Eutrophic
- Trend
- ↑ Improving
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Oyster Lake Causeway is a productive, nutrient-rich eutrophic lake in Walton County, Florida. Water quality is graded C based on 1 sampling years through 2025. Overall water quality is improving over recent sampling years. Compared to the 83 other monitored lakes in Walton County, Oyster Lake Causeway ranks #81 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-02-05. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyModerate
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)
Very murky, less than 3 ft of visibility. Phosphorus level: 59 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | Not graded |
| Phosphorus | 59 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 Oyster Lake Causeway
Compare lakeside cabins, hotels, and vacation rentals near Oyster Lake Causeway in Walton 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 Oyster Lake Causeway
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Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Oyster Lake Causeway typically sits around 88°F at the surface in August. Summer average is about 87°F. Usually warmest in Jul (about 88°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 332 field readings (2010–2025) via the EPA Water Quality Portal. See the full Oyster Lake Causeway water temperature breakdown →
Fishing Oyster Lake Causeway
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.05 m/yr | 5 |
| Phosphorus | ↑ Improving | -0.55 µg/L/yr | 5 |
EPA Impairment Status
Oyster Lake Causeway is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL959C · Official waterbody report · Matched by proximity (0.17 km)
County Ranking
Ranked #81 of 84 lakes in Walton County
Nearby Lakes With Higher Grades
Oyster Lake Causeway holds Grade C. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Walton County
Frequently asked questions about Oyster Lake Causeway
Where is Oyster Lake Causeway?
- Oyster Lake Causeway is a lake in Walton County, Florida. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Oyster Lake Causeway?
- Oyster Lake Causeway in Walton County, Florida has a water quality grade of C (Fair). Water clarity: 3 ft visibility. Phosphorus: 59 µg/L.
Is Oyster Lake Causeway safe to swim in?
- Generally safe for swimming, moderate water quality. Oyster Lake Causeway has a water quality grade of C (Fair). Always check local health department advisories before swimming.
What is the water temperature of Oyster Lake Causeway?
- Oyster Lake Causeway typically sits around 88°F at the surface in August, from 332 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Explore Oyster Lake Causeway across LakeQuality
More Florida Lake Rankings
Other Grade C Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
114 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- CHOCTAWHATCHEE BASIN ALLIANCE
21FLCBA_WQX114 samples · 2020–2025
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