Eufaula Lake
McIntosh County, OklahomaView mapDirections
Oklahoma DEQ publishes the water-quality measurements for Eufaula Lake. Here is what has been measured.
- Impaired · Mercury
- Limited data
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Answers come straight from the public measurements and survey records on this page.
Eufaula Lake in McIntosh County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 1 ft visibility.
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Eufaula Lake is a 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: LakeQuality methodology.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Eufaula Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Eufaula Lake is safe to swim in today is a call for the Oklahoma Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Eufaula Lake
These are the measurements Oklahoma DEQ publishes for Eufaula Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1 ft of visibility. TSI 78.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 ft | Measured, not scored |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 78 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
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 |
EPA Impairment Status
Eufaula Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit OK220600010020_00 · Official waterbody report
Nearby Lakes in McIntosh County
Frequently asked questions about Eufaula Lake
Where is Eufaula Lake?
- Eufaula Lake is a lake in McIntosh County, Oklahoma. Its water-quality measurements are published by Oklahoma DEQ and shown on this page as reported.
What is the water quality of Eufaula Lake?
- Eufaula Lake in McIntosh County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 1 ft visibility.
Is Eufaula Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Eufaula Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Explore Eufaula Lake across LakeQuality
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database