Scs-Maysville Laterals Site-L6 Reservoir Report
Last Updated: December 14, 2025
SCS-Maysville Laterals Site-L6, located in Garvin, Oklahoma, is a state-regulated earth dam built in 1974 by the USDA NRCS for flood risk reduction along the TR-Washita River.
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Summary
Standing at a height of 31 feet with a length of 1020 feet, this dam has a NID storage capacity of 335 acre-feet, with a normal storage capacity of 47 acre-feet over a surface area of 14 acres. The dam features a controlled spillway with a width of 1 foot and an outlet gate with a valve.
Despite being classified as low hazard potential, the risk assessment for SCS-Maysville Laterals Site-L6 identifies a very high risk level, indicating the importance of ongoing monitoring and maintenance. The dam is under state jurisdiction and regulation by the OWRB, with state permitting, inspection, and enforcement in place. While the condition assessment is currently listed as "Not Rated," the last inspection conducted dates back to 1980, emphasizing the need for updated assessments and emergency action plans to meet guidelines for risk management.
For water resource and climate enthusiasts, SCS-Maysville Laterals Site-L6 provides a fascinating case study of dam infrastructure in Oklahoma. The dam's association with flood risk reduction along the TR-Washita River highlights the critical role of such structures in managing water resources and mitigating the impacts of extreme weather events. With a focus on state regulation, inspection, and enforcement, this site serves as a reminder of the importance of proactive measures to ensure the safety and effectiveness of water management infrastructure in the face of evolving climate challenges.
Year Completed |
1974 |
Dam Length |
1020 |
Dam Height |
31 |
River Or Stream |
TR-WASHITA RIVER |
Primary Dam Type |
Earth |
Surface Area |
14 |
Hydraulic Height |
31 |
Nid Storage |
335 |
Structural Height |
31 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
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 |
Washita River At Alex
|
236cfs |
Rock Creek At Sulphur
|
8cfs |
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-L6