Ft. Cobb Lake
Caddo County, Oklahoma13 acresView mapDirections
Nutrients and algae run above the regional average.
↑ up from F at the last regrade
- Hypereutrophic
- #1 of 1 in the county
- Limited data
Ft. Cobb Lake in Caddo County, Oklahoma has a water quality grade of D (Nutrient-rich). Phosphorus: 220 µg/L. Surface area: 13 acres.
- Area
- 13 acres
- Type
- Hypereutrophic
- Phosphorus
- 220 µg/L
- Trend
- ↑ Improving
Stays via Stay22
Stays near Ft. Cobb Lake
Compare lakeside cabins, hotels, and vacation rentals near Ft. Cobb Lake in Caddo 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 Ft. Cobb Lake are listed below.
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Watch Ft. Cobb Lake’s letter
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Ft. Cobb Lake is a 13-acre highly nutrient-loaded hypereutrophic lake in Caddo County, Oklahoma. Water quality is graded D based on 1 sampling years through 2025. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, ODEQ, last sampled 2025-09-29. 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. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus 220 µg/L. TSI 82. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 220 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 82 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 13 acres |
No bathymetric survey has been published for Ft. Cobb Lake, so its depth is not documented here.
Fishing Ft. Cobb Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -80 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Ft. Cobb Lake is a man-made reservoir impounded by the SCS-Sugar Creek Site-046 (completed 1971), built primarily for flood risk reduction on the Tr-Washita River, 41 ft tall and 650 ft long.
- Surface area
- 13 ac
- Normal storage
- 66 ac-ft
- Max storage
- 204 ac-ft
- Drainage area
- 1.61 sq mi
- Hazard class
- Low
- Owner
- SOUTH CADDO CONS DIST
Source: USACE National Inventory of Dams, NID ID OK20796 · Operator website · Matched by proximity (0.81 km)
County Ranking
Ranked #1 of 1 lakes in Caddo County
Nearby Lakes in Caddo County
Frequently asked questions about Ft. Cobb Lake
Where is Ft. Cobb Lake?
- Ft. Cobb Lake is a lake in Caddo County, Oklahoma. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Ft. Cobb Lake?
- Ft. Cobb Lake in Caddo County, Oklahoma has a water quality grade of D (Nutrient-rich). Phosphorus: 220 µg/L. Surface area: 13 acres.
Is Ft. Cobb Lake safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Ft. Cobb Lake 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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Where this data comes from
37 measurements from 1 monitoring station, 2023–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wichita Department of Environmental Programs (Tribal)
WDEP_WQX37 samples · 2023–2025
Analytical methods
- 4500 P B ~ Phosphorus, sample preparation method
Monitoring station identifiers (1)
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.