Morris Sa Reservoir Report
Last Updated: December 13, 2025
Morris Sa is a privately owned dam located in McClain County, Oklahoma, specifically in the city of Maysville.
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Summary
Completed in 1950, this earth dam stands at a height of 25 feet and has a storage capacity of 93 acre-feet. The dam plays a crucial role in managing water resources in the area, particularly in regulating the flow of TR-Finn Creek.
Managed by the Oklahoma Water Resources Board, Morris Sa is state-regulated and undergoes regular inspection and enforcement to ensure its safety and functionality. The dam has a controlled spillway and a low hazard potential, with a very high risk assessment rating. It is equipped with a valve outlet gate and has a maximum discharge capacity of 3,210 cubic feet per second. Despite its age, Morris Sa continues to serve its primary purpose effectively and efficiently.
For water resource and climate enthusiasts, Morris Sa is a significant structure in Oklahoma's infrastructure that highlights the importance of proper dam management and maintenance. Its location, design, and regulatory oversight demonstrate the critical role it plays in protecting communities from potential flooding and ensuring sustainable water usage in the region. As a low-hazard dam with a high risk assessment rating, Morris Sa serves as a reminder of the ongoing challenges and responsibilities associated with managing water resources in a changing climate.
Year Completed |
1950 |
Dam Length |
610 |
Dam Height |
25 |
River Or Stream |
TR-FINN CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
93 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Walnut Creek At Purcell
|
28cfs |
Canadian River At Purcell
|
201cfs |
North Criner Creek Near Criner
|
1cfs |
Washita River Near Pauls Valley
|
327cfs |
Canadian River At Norman
|
213cfs |
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.
Morris Sa