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.
- Limited data
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.
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. Methodology: how these readings are compared.
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. 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.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.2ft | 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. | 66 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Fort Gibson Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
19,900 acres
No bathymetric survey has been published for Fort Gibson Lake, so its depth is not documented here.
Stays via Stay22
Stays near Fort Gibson Lake
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Fishing Fort Gibson Lake
Water Quality Trend: Improving
Based on 4 years of monitoring (2013–2023).
Water clarity
Improving4 years
Phosphorus
Improving-38.9 µg/L/yr2 years
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
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. Check local advisories before you swim.
Explore Fort Gibson Lake across LakeQuality
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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.