Scs-Maysville Laterals Site-H34 Reservoir Report
Last Updated: December 7, 2025
SCS-Maysville Laterals Site-H34 is a state-regulated dam located in Garvin, Oklahoma, with a primary purpose of flood risk reduction.
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Summary
Built in 1979 by the USDA NRCS, this earth dam stands at a height of 33 feet and has a hydraulic height of 30 feet. With a capacity of 356 acre-feet, the dam has a controlled spillway and is equipped with a single valve outlet gate. Despite being rated as having a low hazard potential, it is classified as having a very high risk due to its location in an area prone to flooding.
The dam, situated on TR-Happy Hollow Creek, serves as a vital structure for flood control in the region. It is under the regulatory oversight of the Oklahoma Water Resources Board (OWRB) and is subject to state permitting, inspection, and enforcement. While the dam has not been rated for its current condition, it is inspected every five years to ensure its integrity and functionality. With a risk assessment indicating a very high risk level, the dam plays a crucial role in managing floodwaters and protecting the surrounding areas from potential inundation.
Despite its low hazard potential, the SCS-Maysville Laterals Site-H34 dam is considered to be at a high risk due to its location and the potential impact of flooding. As a part of the flood risk reduction infrastructure in Garvin, Oklahoma, this earth dam is designed to mitigate the impact of high water levels and provide essential protection to the local community. With its controlled spillway and valve outlet gate, the dam is a key component in the region's water resource management system and plays a critical role in safeguarding against the threat of flooding.
Year Completed |
1979 |
Dam Length |
1230 |
Dam Height |
33 |
River Or Stream |
TR-HAPPY HOLLOW CR |
Primary Dam Type |
Earth |
Surface Area |
23 |
Hydraulic Height |
30 |
Nid Storage |
356 |
Structural Height |
33 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North Criner Creek Near Criner
|
1cfs |
Washita River At Alex
|
243cfs |
Washita River Near Pauls Valley
|
337cfs |
Walnut Creek At Purcell
|
31cfs |
Canadian River At Purcell
|
212cfs |
Little Washita River East Of Ninnekah
|
19cfs |
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-H34