Simpson Gss #1 Reservoir Report
Last Updated: December 13, 2025
Simpson Gss #1 is a privately owned earth dam located in Warwick, Lincoln County, Oklahoma.
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Summary
Designed by the USDA NRCS and completed in 1986, this dam serves as a vital structure on a tributary of the Deep Fork of North Canadian River. With a height of 25 feet and a length of 230 feet, Simpson Gss #1 has a storage capacity of 60 acre-feet and a maximum discharge of 320 cubic feet per second.
Despite being classified as a low hazard potential structure, Simpson Gss #1 is considered to have a moderate risk level due to its condition assessment being labeled as "Not Rated." The dam features an uncontrolled spillway with a width of 35 feet, ensuring proper water flow management during periods of high discharge. While the dam has not been inspected recently and lacks an emergency action plan, it remains a crucial component of the local water resource infrastructure in the region.
With Congressman Frank D. Lucas representing the area, Simpson Gss #1 plays a significant role in water resource management and climate resilience efforts in Lincoln County, Oklahoma. As enthusiasts of water resources and climate conservation, understanding the condition and risk level of structures like Simpson Gss #1 is essential for maintaining the safety and sustainability of our water infrastructure for future generations.
Year Completed |
1986 |
Dam Length |
230 |
Dam Height |
25 |
River Or Stream |
TRIB OF DEEP FK OF N CANADIAN |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Drainage Area |
0.25 |
Nid Storage |
60 |
Hazard Potential |
Low |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Deep Fork At Warwick
|
24cfs |
North Canadian River Near Harrah
|
664cfs |
North Canadian River At Britton Rd At Okc
|
366cfs |
Cimarron River Near Ripley
|
498cfs |
North Canadian River At Shawnee
|
253cfs |
Cottonwood Creek Near Seward
|
66cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Simpson Gss #1