Smith Gp6 Reservoir Report
Nearby: Smith Gp-3 Smith #4
Last Updated: December 23, 2025
Smith Gp6 is a privately owned dam located in Harper County, Oklahoma, near Fort Supply.
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Summary
Built in 1959 by the USDA NRCS, this earth dam stands at 30 feet tall and spans 148 feet in length, with a maximum storage capacity of 58 acre-feet. The dam is regulated by the Oklahoma Water Resources Board and is designed to control the flow of the TR-Sand Creek.
Despite its low hazard potential, Smith Gp6 is classified as having a very high risk due to its condition assessment not being rated. The dam features a controlled spillway, one valve outlet gate, and is inspected every five years. The surrounding area is at risk of inundation in the event of a breach, highlighting the importance of ongoing management and maintenance to ensure the safety and integrity of the structure.
With its historical significance and vital role in water resource management, Smith Gp6 serves as a key example of the need for proactive risk assessment and management measures in the face of climate change and increasing pressure on our water infrastructure. As a part of the Tulsa District, this dam underscores the importance of collaboration between private owners, regulatory agencies, and designers to safeguard our communities and ecosystems for the future.
Year Completed |
1959 |
Dam Length |
148 |
Dam Height |
30 |
River Or Stream |
TR-SAND CR |
Primary Dam Type |
Earth |
Hydraulic Height |
28 |
Nid Storage |
58 |
Structural Height |
30 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Smith Gp6