Oglala Lakota County, South Dakota · Water Quality Report Card
White Clay Reservoir
White Clay Reservoir in Oglala Lakota County, South Dakota is not rated for water quality — its monitoring record does not meet the evidence bar.
- Mean depth
- ~7 ft est.
White Clay Reservoir is a lake in Oglala Lakota County, South Dakota with an estimated average depth of about 7 feet.
Source: EPA Water Quality Portal sampling records, SD DANR, last sampled 2024-10-09. Grade methodology: LakeGrade methodology.
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Swimming Safety
Based on E. coli testing, White Clay Reservoir routinely exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 44.8% of 29 samples across 6 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check South Dakota’s current beach and health-department advisories before swimming.
Water Quality Grade: Not rated
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data |
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~7 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. South Dakota has not published bathymetry for White Clay Reservoir.
Where to stay near White Clay Reservoir
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Fishing White Clay Reservoir
Location
Nearby Lakes in Oglala Lakota County
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More records, surveys & data sources
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.
Where this data comes from
18 measurements from 1 monitoring station, 2023–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Oglala Sioux Tribe (South Dakota) (Tribal)
OGLALAST18 samples · 2023–2024
Analytical methods
- Turbidity by Nephelometry
Monitoring station identifiers (1)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2024-10-09
Monitoring stations: 1