McIntosh County, Oklahoma · Water Quality Report Card
Eufaula Lake
Eufaula Lake in McIntosh County, Oklahoma is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1 ft visibility.
- Clarity
- 1 ft
- Type
- Hypereutrophic
- Trend
- ↓ Declining
Eufaula Lake is a highly nutrient-loaded hypereutrophic lake in McIntosh County, Oklahoma. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, ODEQ, last sampled 2024-11-05. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not rated for swimming — there is not enough monitoring data to judge this lake
Water Quality Grade: Not rated
Very murky, less than 1 ft of visibility. Trophic State Index: 78.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 ft | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 78 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Eufaula Lake
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Fishing Eufaula Lake
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -1.201 m/yr | 4 |
Location
Nearby Lakes in McIntosh County
Explore Eufaula Lake across LakeGrade
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Very high nutrients, dense algae, poor clarity
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Where this data comes from
66 measurements from 3 monitoring stations, 2016–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- OWRB Lakes Monitoring
OKWRB-LAKES_WQX66 samples · 2016–2024
Analytical methods
- OWRB Lakes Field Data Collection
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Determination of Turbidity
Monitoring station identifiers (3)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2024-11-05
Monitoring stations: 3