Scs-Maysville Laterals Site-H09a Reservoir Report
Last Updated: December 13, 2025
SCS-Maysville Laterals Site-H09a, located in Garvin, Oklahoma, is a state-regulated dam designed by the USDA NRCS for flood risk reduction along the TR-Washita River.
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Summary
Completed in 1972, this earth dam stands at a height of 25 feet and has a length of 1040 feet. With a storage capacity of 241 acre-feet, the dam serves its primary purpose of flood risk reduction effectively, with a spillway type of controlled to manage water discharge during high flow events.
Despite its low hazard potential and a very high risk assessment rating, the condition of SCS-Maysville Laterals Site-H09a is currently not rated. The last inspection was conducted in 1980, with an inspection frequency of 5 years. The dam features one valve outlet gate for water release. While the dam has not been modified in recent years, it is crucial for the regulatory agency, OWRB, to ensure regular inspections and maintenance to uphold its structural integrity and continue providing flood risk reduction benefits to the community of Maysville.
Year Completed |
1972 |
Dam Length |
1040 |
Dam Height |
25 |
River Or Stream |
TR-WASHITA RIVER |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
25 |
Nid Storage |
241 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Washita River Near Pauls Valley
|
327cfs |
North Criner Creek Near Criner
|
1cfs |
Walnut Creek At Purcell
|
28cfs |
Canadian River At Purcell
|
201cfs |
Washita River At Alex
|
236cfs |
Little Washita River East Of Ninnekah
|
18cfs |
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-Maysville Laterals Site-H09a