Scs-Cherokee Sandy Site-08 Reservoir Report
Last Updated: December 8, 2025
SCS-Cherokee Sandy Site-08 is a state-regulated dam located in Garvin, Oklahoma, specifically in the city of Wynnewood.
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Summary
It was designed by the USDA NRCS and completed in 1963 for the primary purpose of flood risk reduction along the Willow Sandy Creek. The dam is an earth-type structure with a height of 33 feet and a length of 1530 feet, providing a maximum storage capacity of 1211 acre-feet.
Despite being classified as having a low hazard potential, the dam is considered to have a very high risk due to its location and potential consequences of failure. The dam has a controlled spillway with a width of 1 foot and is equipped with one valve outlet gate for water release. Although the dam has not been inspected since 1980, it is still maintained by the state regulatory agency, OWRB, with regular inspections, permitting, and enforcement in place to ensure its safety and functionality for flood risk mitigation in the region.
For water resource and climate enthusiasts, SCS-Cherokee Sandy Site-08 serves as an important infrastructure for managing flood risks in the region and highlights the ongoing efforts of state agencies to regulate and maintain critical water infrastructure. With its historical significance and continued relevance in flood control, this dam showcases the importance of proactive risk management measures and regular inspections to ensure the safety and integrity of water storage structures in Oklahoma.
Year Completed |
1963 |
Dam Length |
1530 |
Dam Height |
33 |
River Or Stream |
WILLOW SANDY CREEK |
Primary Dam Type |
Earth |
Surface Area |
50 |
Hydraulic Height |
28 |
Nid Storage |
1211 |
Structural Height |
33 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Washita River Near Pauls Valley
|
335cfs |
Rock Creek At Sulphur
|
8cfs |
Canadian River At Purcell
|
208cfs |
Walnut Creek At Purcell
|
29cfs |
Little River Near Tecumseh
|
7cfs |
Pennington Creek Near Reagan
|
7cfs |
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.
Scs-Cherokee Sandy Site-08