Morris Sa Reservoir Report
Last Updated: December 13, 2025
Morris Sa, located in McClain County, Oklahoma, is a privately owned earth dam constructed in 1960 on TR-Gaddis Creek.
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Summary
With a height of 20 feet and a storage capacity of 91 acre-feet, this dam serves multiple purposes and is regulated by the Oklahoma Water Resources Board. Despite being deemed low hazard potential, Morris Sa is categorized as having a very high risk assessment, suggesting a need for vigilant monitoring and management.
The dam features a controlled spillway, a valve outlet gate, and a drainage area that discharges up to 1160 cubic feet per second. Its construction of stone core and soil foundation reflects a traditional design, while its inspection frequency of every five years ensures ongoing safety and maintenance. Although currently rated as "Not Rated" for condition assessment, the dam's risk profile highlights the importance of proactive emergency preparedness and risk management measures.
As a key component of the Tulsa District's water infrastructure, Morris Sa is a critical asset in the region's water resource management. Its strategic location and significant storage capacity make it an essential player in flood control and water supply for the surrounding area. Climate and water resource enthusiasts will find Morris Sa's unique design and operational details fascinating, underscoring the intersection of infrastructure, regulation, and environmental stewardship in sustaining water resources for future generations.
Year Completed |
1960 |
Dam Length |
380 |
Dam Height |
20 |
River Or Stream |
TR-GADDIS CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
91 |
Structural Height |
20 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Walnut Creek At Purcell
|
28cfs |
Canadian River At Purcell
|
201cfs |
Washita River Near Pauls Valley
|
327cfs |
North Criner Creek Near Criner
|
1cfs |
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