Grand Lake is a highly nutrient-loaded hypereutrophic lake in Chicot County, Arkansas. Water quality is graded F based on 2 sampling years through 2025. Compared to the 5 other monitored lakes in Chicot County, Grand Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Arkansas DNR, last sampled 2025-11-17. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
No clarity data. Phosphorus level: 300 µg/L. Chlorophyll-a: 115.5 µg/L. Trophic State Index: 82.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 300 µg/L | F |
| Chlorophyll-a (Algae) | 115.5 µg/L | F |
| Trophic State Index (TSI) | 82 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
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Fishing Grand Lake
Location
County Ranking
Ranked #5 of 6 lakes in Chicot County
Cleaner Lakes Within 30 Miles
Grand Lake holds Grade F. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Chicot County
Explore Grand Lake across LakeGrade
More Arkansas Lake Rankings
Other Grade F Lakes in Arkansas
Hypereutrophic Lakes in Arkansas
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-11-17
Monitoring stations: 1