Fort Gibson Lake
Wagoner County, Oklahoma19,900 acresView mapDirections
Oklahoma DEQ publishes the water-quality measurements for Fort Gibson Lake. Here is what has been measured.
- Impaired · Oxygen depletion (low DO)
- Limited data
Ask about Fort Gibson Lake
Answers come straight from the public measurements and survey records on this page.
Fort Gibson Lake in Wagoner County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 2.2 ft visibility. Surface area: 19900 acres.
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Fort Gibson Lake is a 19,900-acre lake in Wagoner County, Oklahoma. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, ODEQ, last sampled 2023-11-06. Grade methodology: LakeQuality methodology.
What Fort Gibson Lake is good for
From access and monitoring records, not editorial picks.
- Big water19,900 acres
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Fort Gibson Lake is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
Whether Fort Gibson Lake 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 Gibson Lake
These are the measurements Oklahoma DEQ publishes for Fort Gibson Lake, 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 2.2 ft of visibility. TSI 66.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.2 ft | Measured, not scored |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 19,900 acres |
No bathymetric survey has been published for Fort Gibson Lake, so its depth is not documented here.
Fishing Fort Gibson Lake
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.981 m/yr | 4 |
| Phosphorus | ↑ Improving | -38.9 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Fort Gibson Lake is a man-made reservoir impounded by the Fort Gibson Dam - Dike 10 (completed 1949), built primarily for flood risk reduction on the Grand River; gravity-type dam, 30 ft tall and 8,087 ft long.
- Surface area
- 19,900 ac
- Normal storage
- 365,200 ac-ft
- Max storage
- 1,134,575 ac-ft
- Drainage area
- 12,494 sq mi
- Hazard class
- High
- Owner
- USACE - Tulsa District
Source: USACE National Inventory of Dams, NID ID OK10314 · Operator website
EPA Impairment Status
Fort Gibson Lake 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 OK121600010050_00 · Official waterbody report
Nearby Lakes in Wagoner County
Frequently asked questions about Fort Gibson Lake
Where is Fort Gibson Lake?
- Fort Gibson Lake is a lake in Wagoner 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 Gibson Lake?
- Fort Gibson Lake in Wagoner County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 2.2 ft visibility. Surface area: 19900 acres.
Is Fort Gibson Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Fort Gibson Lake is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
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Where this data comes from
88 measurements from 8 monitoring stations, 2017–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- OWRB Lakes Monitoring
OKWRB-LAKES_WQX88 samples · 2017–2023
Analytical methods
- OWRB Lakes Field Data Collection
- Determination of Turbidity
Monitoring station identifiers (8)
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