Grand Lake
Chicot County, ArkansasView mapDirections
Nutrients and algae run well above the regional average.
- Hypereutrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- #3 of 4 in the county
- 29 ft max depth
- Public access
- Limited data
Grand Lake in Chicot County, Arkansas has a water quality grade of F (Algae-prone). Phosphorus: 300 µg/L. Chlorophyll-a (algae): 115.5 µg/L.
- Max depth
- ~29 ft est.
- Type
- Hypereutrophic
- Phosphorus
- 300 µg/L
- Chlorophyll-a
- 115.5 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Stays near Grand Lake
Compare lakeside cabins, hotels, and vacation rentals near Grand Lake in Chicot County, Arkansas — 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 are listed below.
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Grand Lake is a highly nutrient-loaded hypereutrophic lake in Chicot County, Arkansas with an estimated average depth of about 29 feet. Water quality is graded F based on 3 sampling years through 2025. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 3 other monitored lakes in Chicot County, Grand Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2025-11-17. Grade methodology: LakeQuality methodology.
What Grand Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
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.
The F is nutrients and algae, not a swimming clearance. Grand Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water Quality Grade: F (Algae-prone)
No clarity data. Phosphorus 300 µg/L. Chlorophyll-a 115.5 µg/L. TSI 82. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 300 µg/L | Poor |
| Chlorophyll-a (Algae) | 115.5 µg/L | Poor |
| Trophic State Index (TSI) | 82 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~29 ft est. |
| Average Depth | ~8 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Arkansas has not published bathymetry for Grand Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
Fishing Grand Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -180 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -33.2 µg/L/yr | 3 |
EPA Impairment Status
Grand Lake 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 AR_08050002_4020 · Official waterbody report
County Ranking
Ranked #3 of 4 lakes in Chicot County
Nearby Lakes in Chicot County
Frequently asked questions about Grand Lake
Where is Grand Lake?
- Grand Lake is a lake in Chicot County, Arkansas. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Grand Lake?
- Grand Lake in Chicot County, Arkansas has a water quality grade of F (Algae-prone). Phosphorus: 300 µg/L. Chlorophyll-a (algae): 115.5 µg/L.
Is Grand Lake safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Grand Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Grand Lake?
- No published bathymetric survey covers Grand Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 29 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Grand Lake?
- Grand Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Public access is listed as yes.
Explore Grand Lake across LakeQuality
Species activity outlook by water temperature and season
Where to stay at Arkansas's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
Arkansas's cleanest and most-polluted lakes, ranked
More Arkansas Lake Rankings
Other Grade F Lakes in Arkansas
Hypereutrophic Lakes in Arkansas
Where this data comes from
33 measurements from 1 monitoring station, 2023–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Arkansas Department of Environmental Quality
ARDEQH2O_WQX33 samples · 2023–2025
Analytical methods
- 4500 P J ~ Persulfate Method for Simultaneous Determination of Total Nitrogen and Total Phosphorus
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- Turbidity by Nephelometry
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory