Wewoka Lake
Seminole County, Oklahoma371 acresView mapDirections
Nutrients and algae run above the regional average.
↓ down from C at the last regrade
- Eutrophic
- Impaired · Algal growth
- #4 of 4 in the county
- 41 ft max depth
- Limited data
Wewoka Lake in Seminole County, Oklahoma has a water quality grade of D (Nutrient-rich). Water clarity: 2.5 ft visibility. Phosphorus: 55 µg/L. Surface area: 371 acres.
- Clarity
- 2.5 ft
- Max depth
- ~41 ft est.
- Area
- 371 acres
- Type
- Eutrophic
- Phosphorus
- 55 µg/L
- Trend
- ↑ Improving
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Stays near Wewoka Lake
Compare lakeside cabins, hotels, and vacation rentals near Wewoka Lake in Seminole County, Oklahoma — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Wewoka Lake are listed below.
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Watch Wewoka Lake’s letter
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Wewoka Lake is a 371-acre productive, nutrient-rich eutrophic lake in Seminole County, Oklahoma with an estimated average depth of about 41 feet. Water quality is graded D based on 1 sampling years through 2023. Overall water quality is improving over recent sampling years. Compared to the 3 other monitored lakes in Seminole County, Wewoka Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, ODEQ, last sampled 2023-10-17. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
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. Wewoka Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury, turbidity. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 2.5 ft of visibility. Phosphorus 55 µg/L. TSI 63. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 ft | Not graded |
| Phosphorus | 55 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~41 ft est. |
| Average Depth | ~9 ft est. |
| Surface Area | 371 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Oklahoma has not published bathymetry for Wewoka Lake.
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 Wewoka Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.667 m/yr | 2 |
| Phosphorus | ↑ Improving | -8.93 µg/L/yr | 3 |
Reservoir Info (USACE NID)
Wewoka Lake is a man-made reservoir impounded by the Wewoka (completed 1925), built primarily for water supply on the Coon Creek; earth-type dam, 38 ft tall and 1,050 ft long.
- Surface area
- 371 ac
- Normal storage
- 3,301 ac-ft
- Max storage
- 9,070 ac-ft
- Drainage area
- 16.3 sq mi
- Hazard class
- High
- Owner
- City of Wewoka
Source: USACE National Inventory of Dams, NID ID OK10487 · Operator website
EPA Impairment Status
Wewoka 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 OK520500020190_00 · Official waterbody report
County Ranking
Ranked #4 of 4 lakes in Seminole County
Nearby Lakes in Seminole County
Frequently asked questions about Wewoka Lake
Where is Wewoka Lake?
- Wewoka Lake is a lake in Seminole County, Oklahoma. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Wewoka Lake?
- Wewoka Lake in Seminole County, Oklahoma has a water quality grade of D (Nutrient-rich). Water clarity: 2.5 ft visibility. Phosphorus: 55 µg/L. Surface area: 371 acres.
Is Wewoka Lake safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Wewoka Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury, turbidity. Check local advisories before you swim.
How deep is Wewoka Lake?
- No published bathymetric survey covers Wewoka Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 41 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 371 acres.
Explore Wewoka Lake across LakeQuality
More Oklahoma Lake Rankings
Other Grade D Lakes in Oklahoma
Eutrophic Lakes in Oklahoma
Where this data comes from
56 measurements from 4 monitoring stations, 2012–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- OWRB Lakes Monitoring
OKWRB-LAKES_WQX29 samples · 2019–2023 - The Seminole Nation of Oklahoma (Tribal)
SNEPO_WQX27 samples · 2012–2016
Analytical methods
- OWRB Lakes Field Data Collection
- Determination of Turbidity
Monitoring station identifiers (4)
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)