Scs-Chigley Sandy Creek Site-05 Reservoir Report
Last Updated: December 12, 2025
SCS-Chigley Sandy Creek Site-05, located in Garvin, Oklahoma, is a state-regulated earth dam designed by USDA NRCS and completed in 1955 for flood risk reduction along TR-WEST BR CHIGLEY SANDY CRK.
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Summary
The dam stands at a height of 28 feet with a hydraulic height of 23 feet and a length of 1200 feet, providing a maximum storage capacity of 187 acre-feet. With a controlled spillway and a low hazard potential, this structure plays a crucial role in managing water flow in the area.
Despite being last inspected in 1980 and rated as 'Not Rated' in condition assessment, SCS-Chigley Sandy Creek Site-05 remains a vital piece of infrastructure in the region. The dam has an emergency action plan (EAP) and emergency contacts, but its risk assessment indicates a very high risk level, emphasizing the importance of regular maintenance and oversight. With the dam under state jurisdiction by OWRB and meeting permitting and inspection requirements, its primary purpose of flood risk reduction continues to benefit the community, contributing to water resource management efforts in Oklahoma.
As a part of the flood risk reduction strategy in the area, SCS-Chigley Sandy Creek Site-05 serves as an essential infrastructure project with a stone core and soil foundation. With a maximum discharge capacity of 976 cubic feet per second and a controlled spillway width of 1 foot, the dam's design and construction by the Natural Resources Conservation Service highlight the collaborative efforts to mitigate potential flooding risks. As water resource and climate enthusiasts, understanding the significance of structures like SCS-Chigley Sandy Creek Site-05 is crucial in appreciating the intersection of infrastructure development and environmental stewardship.
Year Completed |
1955 |
Dam Length |
1200 |
Dam Height |
28 |
River Or Stream |
TR-WEST BR CHIGLEY SANDY CRK |
Primary Dam Type |
Earth |
Surface Area |
13 |
Hydraulic Height |
23 |
Nid Storage |
187 |
Structural Height |
28 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Rock Creek At Sulphur
|
8cfs |
Washita River Near Pauls Valley
|
329cfs |
Pennington Creek Near Reagan
|
8cfs |
Washita River Near Dickson
|
322cfs |
Walnut Creek At Purcell
|
28cfs |
Canadian River At Purcell
|
201cfs |
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.
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Scs-Chigley Sandy Creek Site-05