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.
- Impaired · Algal growth
- Public access
- Limited data
Ask about Fort Cobb Reservoir
Answers come straight from the public measurements and survey records on this page.
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.
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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. Grade methodology: LakeQuality methodology.
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. Fort Cobb Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, turbidity. 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.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 ft | Measured, not scored |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 69 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Current Conditions
USGS snapshot Sep 7, 2026, 4:00 PM from gauge 07325900 (Fort Cobb Reservoir near Fort Cobb, OK). Station page ↗ — a live reading replaces this snapshot when the gauge responds. Missing live data is not an all-clear.
→ Fort Cobb Reservoir water level: the live USGS gauge reading
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 5,882 acres |
| Public Access | Yes |
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
Fishing Fort Cobb Reservoir
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +8.716 m/yr | 3 |
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
EPA Impairment Status
Fort Cobb Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit OK310830060020_00 · Official waterbody report
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. Fort Cobb Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, turbidity. Check local advisories before you swim.
What is the water level at Fort Cobb Reservoir?
- The USGS snapshot on this page for Fort Cobb Reservoir is 1339.29 ft of gage height, recorded Sep 7, 2026, 4:00 PM at gauge 07325900. Current Conditions hydrates a live NWIS reading from that same station when the gauge responds. A missed live fetch is not an all-clear.
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.
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
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory