Scs-Maysville Laterals Site-H07 Reservoir Report
Last Updated: December 8, 2025
Located in Garvin County, Oklahoma, the SCS-Maysville Laterals Site-H07 is a state-regulated earth dam with a primary purpose of flood risk reduction.
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Summary
Built in 1972 by the USDA NRCS, this structure stands at 30 feet high and spans 1690 feet in length, with a storage capacity of 285 acre-feet. The dam is situated on the TR-Happy Hollow Creek within the Tulsa District, providing essential protection to the surrounding community from potential flooding events.
Despite its low hazard potential, the SCS-Maysville Laterals Site-H07 remains a critical infrastructure for flood control in the region. With its controlled spillway and one outlet valve, the dam has a maximum discharge capacity of 410 cubic feet per second. Although last inspected in 1980, the structure is deemed to be in good condition and has not been rated for its current state. However, with a very high risk assessment ranking, it is essential for the regulatory agency, OWRB, to continue regular inspections and maintenance to ensure the dam's effectiveness in mitigating flood risks for the area.
For water resource and climate enthusiasts, the SCS-Maysville Laterals Site-H07 presents an intriguing case study in dam engineering and flood risk management. As a vital piece of infrastructure in Garvin County, Oklahoma, this earth dam serves as a key defense against potential inundation from the TR-Happy Hollow Creek. With its historical significance dating back to 1972, the dam's structural integrity and operational efficiency are crucial factors in safeguarding the local community and surrounding areas from the impacts of flooding.
Year Completed |
1972 |
Dam Length |
1690 |
Dam Height |
30 |
River Or Stream |
TR-HAPPY HOLLOW CR |
Primary Dam Type |
Earth |
Surface Area |
9 |
Hydraulic Height |
30 |
Nid Storage |
285 |
Structural Height |
30 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North Criner Creek Near Criner
|
1cfs |
Washita River Near Pauls Valley
|
335cfs |
Washita River At Alex
|
241cfs |
Walnut Creek At Purcell
|
29cfs |
Canadian River At Purcell
|
208cfs |
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-H07