Shamley Gss No.1 Reservoir Report
Last Updated: December 13, 2025
Shamley Gss No.1 is a private dam located in Garvin, Oklahoma, along TR-RUSH CREEK.
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Summary
Built in 1976 by the USDA NRCS, this Earth dam stands at a height of 30 feet and has a length of 650 feet, providing a storage capacity of 420 acre-feet. The dam serves multiple purposes and is regulated by the Oklahoma Water Resources Board.
Despite its low hazard potential, Shamley Gss No.1 is categorized as having a very high risk due to its condition assessment not being rated. The dam features a controlled spillway and a single valve outlet gate. While it has not been inspected since 2002, it is scheduled for inspections every five years. The risk management measures and emergency action plan for the dam are currently not available, highlighting a potential area for improvement in its safety and maintenance protocols.
With its location in a region prone to extreme weather events, water resource and climate enthusiasts should keep a close eye on the condition and management of Shamley Gss No.1. As a vital infrastructure for water storage and flood control, ensuring the proper maintenance and emergency preparedness of this dam is crucial to mitigating potential risks and safeguarding the surrounding communities and ecosystems.
Year Completed |
1976 |
Dam Length |
650 |
Dam Height |
30 |
River Or Stream |
TR-RUSH CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
30 |
Nid Storage |
420 |
Structural Height |
30 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Washita River Near Pauls Valley
|
327cfs |
Walnut Creek At Purcell
|
28cfs |
Canadian River At Purcell
|
201cfs |
North Criner Creek Near Criner
|
1cfs |
Rock Creek At Sulphur
|
8cfs |
Washita River At Alex
|
236cfs |
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.
Shamley Gss No.1