Pottawatomie County, Oklahoma · Water Quality Report Card
Shawnee Twin Lake
Shawnee Twin Lake in Pottawatomie County, Oklahoma is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3 ft visibility.
- Clarity
- 3 ft
- Type
- Eutrophic
- Trend
- ↑ Improving
Shawnee Twin Lake is a productive, nutrient-rich eutrophic lake in Pottawatomie County, Oklahoma. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, ODEQ, last sampled 2024-11-13. 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 3 ft of visibility. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Shawnee Twin Lake
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Fishing Shawnee Twin Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +4.188 m/yr | 5 |
Location
Nearby Lakes in Pottawatomie County
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Eutrophic Lakes in Oklahoma
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Where this data comes from
115 measurements from 7 monitoring stations, 2016–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- OWRB Lakes Monitoring
OKWRB-LAKES_WQX115 samples · 2016–2024
Analytical methods
- OWRB Lakes Field Data Collection
- Determination of Turbidity
Monitoring station identifiers (7)
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: 2024-11-13
Monitoring stations: 7