Grand Lake Southwest of Gueydan
Grand Lake Southwest of Gueydan in Cameron Parish County, Louisiana has a water quality grade of D (Nutrient-rich). Phosphorus: 140 µg/L.
- Type
- Hypereutrophic
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Grand Lake Southwest of Gueydan →
Grand Lake Southwest of Gueydan is a highly nutrient-loaded hypereutrophic lake in Cameron Parish County, Louisiana. Water quality is graded D based on 1 sampling years through 2023.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-10-03. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus level: 140 µg/L. Trophic State Index: 75.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 140 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 75 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Grand Lake Southwest of Gueydan
Compare lakeside cabins, hotels, and vacation rentals near Grand Lake Southwest of Gueydan in Cameron Parish County, Louisiana — 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Grand Lake Southwest of Gueydan are listed below.
Top-rated places to stay near Grand Lake Southwest of Gueydan
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Fishing Grand Lake Southwest of Gueydan
EPA Impairment Status
Grand Lake Southwest of Gueydan is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit LA050701_00 · Official waterbody report · Matched by proximity (0 km)
County Ranking
Ranked #1 of 1 lakes in Cameron Parish County
Nearby Lakes in Cameron Parish County
Frequently asked questions about Grand Lake Southwest of Gueydan
Where is Grand Lake Southwest of Gueydan?
- Grand Lake Southwest of Gueydan is a lake in Cameron Parish County, Louisiana. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Grand Lake Southwest of Gueydan?
- Grand Lake Southwest of Gueydan in Cameron Parish County, Louisiana has a water quality grade of D (Nutrient-rich). Phosphorus: 140 µg/L.
Is Grand Lake Southwest of Gueydan safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Grand Lake Southwest of Gueydan has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
Explore Grand Lake Southwest of Gueydan across LakeGrade
More Louisiana Lake Rankings
Other Grade D Lakes in Louisiana
Beauregard Parish County · Nutrient-rich
Pointe Coupee Parish County · Nutrient-rich
Pointe Coupee Parish County · Nutrient-rich
Assumption Parish County · Nutrient-rich
Grant Parish County · Nutrient-rich
East Baton Rouge Parish County · Nutrient-rich
Hypereutrophic Lakes in Louisiana
Where this data comes from
20 measurements from 1 monitoring station, 2022–2023. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- LDEQ/Water Planning and Assessment (Louisiana)
LADEQWPD_WQX20 samples · 2022–2023
Analytical methods
- Total Phosphorus After Block Digestion
- 2130 B ~ Nephelometric Method
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