Lake Nahni Waiya Tuskahomma
Pushmataha County, Oklahoma131 acresView mapDirections
Nutrients and algae run above the regional average.
↑ up from F at the last regrade
- Hypereutrophic
- Impaired · Oxygen depletion (low DO)
- #1 of 2 in the county
- 32 ft max depth
- Public access
Lake Nahni Waiya Tuskahomma in Pushmataha County, Oklahoma has a water quality grade of D (Nutrient-rich). Phosphorus: 250 µg/L. Surface area: 131 acres.
- Max depth
- ~32 ft est.
- Area
- 131 acres
- Type
- Hypereutrophic
- Phosphorus
- 250 µg/L
- Trend
- → Stable
- Public access
- Yes
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Stays near Lake Nahni Waiya Tuskahomma
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Watch Lake Nahni Waiya Tuskahomma’s letter
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Lake Nahni Waiya Tuskahomma is a 131-acre highly nutrient-loaded hypereutrophic lake in Pushmataha County, Oklahoma with an estimated average depth of about 32 feet. Water quality is graded D based on 2 sampling years through 2026. Limited fish-species data available. Public access is available. Compared to the 1 other monitored lakes in Pushmataha County, Lake Nahni Waiya Tuskahomma ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, ODEQ, last sampled 2026-03-25. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyElevated nutrients
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 D is nutrients and algae, not a swimming clearance. Lake Nahni Waiya Tuskahomma is listed impaired under Clean Water Act §303(d) for oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus 250 µg/L. TSI 84. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 250 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 84 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~32 ft est. |
| Average Depth | ~9 ft est. |
| Surface Area | 131 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Oklahoma has not published bathymetry for Lake Nahni Waiya Tuskahomma.
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.
Fishing Lake Nahni Waiya Tuskahomma
Water Quality Trend: → Stable
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | → Stable | +1.07 µg/L/yr | 8 |
Reservoir Info (USACE NID)
Lake Nahni Waiya Tuskahomma is a man-made reservoir impounded by the Nanih Waiya Lake (completed 1958), built primarily for recreation on the Tr-Kiamichi Riv, 35 ft tall and 1,500 ft long.
- Surface area
- 131 ac
- Normal storage
- 1,064 ac-ft
- Max storage
- 693 ac-ft
- Drainage area
- 4.05 sq mi
- Hazard class
- Low
- Owner
- Dept of Wildlife
Source: USACE National Inventory of Dams, NID ID OK02343 · Operator website · Matched by proximity (0.44 km)
EPA Impairment Status
Lake Nahni Waiya Tuskahomma is officially listed as impaired under Clean Water Act §303(d) in the 2023 EPA reporting cycle.
Causes of impairment
Source: EPA ATTAINS assessment unit LNW-001 · Official waterbody report · Matched by proximity (0.29 km)
County Ranking
Ranked #1 of 2 lakes in Pushmataha County
Nearby Lakes in Pushmataha County
Frequently asked questions about Lake Nahni Waiya Tuskahomma
Where is Lake Nahni Waiya Tuskahomma?
- Lake Nahni Waiya Tuskahomma is a lake in Pushmataha County, Oklahoma. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Nahni Waiya Tuskahomma?
- Lake Nahni Waiya Tuskahomma in Pushmataha County, Oklahoma has a water quality grade of D (Nutrient-rich). Phosphorus: 250 µg/L. Surface area: 131 acres.
Is Lake Nahni Waiya Tuskahomma safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Lake Nahni Waiya Tuskahomma is listed impaired under Clean Water Act §303(d) for oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
How deep is Lake Nahni Waiya Tuskahomma?
- No published bathymetric survey covers Lake Nahni Waiya Tuskahomma, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 32 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 131 acres.
Explore Lake Nahni Waiya Tuskahomma across LakeQuality
Species activity outlook by water temperature and season
Where to stay at Oklahoma's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
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Other Grade D Lakes in Oklahoma
Hypereutrophic Lakes in Oklahoma
Where this data comes from
1,147 measurements from 3 monitoring stations, 2018–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- The Choctaw Nation of Oklahoma (Tribal)
CHOCNATWQX1,147 samples · 2018–2026
Analytical methods
- Persulfate Digestion Method
- Total Phosphorus in Water
- Nitrogen, Kjeldahl - Simplified Spectrophotometric Measurement of Total Kjeldahl Nitrogen in Water and Wastewater
Monitoring station identifiers (3)
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)