Fort Cobb Reservoir
Caddo County, Oklahoma5,882 acresView mapDirections
Oklahoma DEQ publishes the water-quality measurements for Fort Cobb Reservoir. Here is what has been measured.
- Public access
- Limited data
Fort Cobb Reservoir in Caddo County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 1.8 ft visibility. Surface area: 5882 acres.
Fort Cobb Reservoir is a 5,882-acre lake in Caddo County, Oklahoma. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 3 public boat landings.
Source: EPA Water Quality Portal sampling records, ODEQ, last sampled 2024-10-07. Methodology: how these readings are compared.
What Fort Cobb Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch3 documented ramps
- Big water5,882 acres
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Fort Cobb Reservoir is safe to swim in today is a call for the Oklahoma Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Fort Cobb Reservoir
These are the measurements Oklahoma DEQ publishes for Fort Cobb Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1.8 ft of visibility. TSI 69.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 69 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Fort Cobb Reservoir
Answers come straight from the public measurements and survey records on this page.
→ Fort Cobb Reservoir water level: the live USGS gauge reading
Lake Details
Surface area
5,882 acres
Public access
Yes
Listed by Oklahoma DEQ
No bathymetric survey has been published for Fort Cobb Reservoir, so its depth is not documented here.
Recreation & Access
- Fort Cobb ReservoirPublic
- Fort Cobb ReservoirPublic
- Fort Cobb ReservoirPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Stays near Fort Cobb Reservoir
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Fishing Fort Cobb Reservoir
Water quality readings over time
3 seasons of samples on record (2012–2019). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Improving3 years
Reservoir Info (USACE NID)
Fort Cobb Reservoir is a man-made reservoir impounded by the Fort Cobb Dam (completed 1959), built primarily for flood risk reduction on the Cobb Cr; earth-type dam, 122 ft tall and 9,900 ft long.
- Surface area
- 5,882 ac
- Normal storage
- 80,010 ac-ft
- Max storage
- 292,390 ac-ft
- Drainage area
- 308 sq mi
- Hazard class
- High
- Owner
- BUREAU OF RECLAMATION
Source: USACE National Inventory of Dams, NID ID OK02502 · Operator website
Nearby Lakes in Caddo County
Frequently asked questions about Fort Cobb Reservoir
Where is Fort Cobb Reservoir?
- Fort Cobb Reservoir is a lake in Caddo County, Oklahoma. Its water-quality measurements are published by Oklahoma DEQ and shown on this page as reported.
What is the water quality of Fort Cobb Reservoir?
- Fort Cobb Reservoir in Caddo County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 1.8 ft visibility. Surface area: 5882 acres.
Is Fort Cobb Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Fort Cobb Reservoir?
- Fort Cobb Reservoir has 3 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Fort Cobb Reservoir, Fort Cobb Reservoir, Fort Cobb Reservoir. Public access is listed as yes.
Can I fish at Fort Cobb Reservoir?
- Fort Cobb Reservoir has 3 documented boat landings in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Oklahoma's fish and wildlife agency, so check its current regulations before you go.
Explore Fort Cobb Reservoir across LakeQuality
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Where this data comes from
59 measurements from 5 monitoring stations, 2016–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- OWRB Lakes Monitoring
OKWRB-LAKES_WQX59 samples · 2016–2024
Analytical methods
- OWRB Lakes Field Data Collection
- Determination of Turbidity
Monitoring station identifiers (5)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory