Nunley W.E. Reservoir Report
Nearby: Oknoname 137086 Fredrick J.C.
Last Updated: December 6, 2025
Nunley W.E.
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Summary
is a privately owned earth dam located in Pumpkin Center, Stephens County, Oklahoma. Built in 1960 with a height of 30 feet and a hydraulic height of 26 feet, this dam serves the primary purpose of water resource management on TR Armstrong Creek. With a storage capacity of 119 acre-feet and a surface area of 5 acres, Nunley W.E. plays a crucial role in flood control and water supply for the region.
Despite being rated as having a low hazard potential, Nunley W.E. is considered to have a very high risk level. The dam features a controlled spillway and a single valve outlet gate for water release. While it has not been inspected since August 2011, the regulatory agency in charge of overseeing the dam - the Oklahoma Water Resources Board (OWRB) - has indicated that state permitting, inspection, and enforcement processes are in place to ensure the safety and integrity of the structure.
For water resource and climate enthusiasts, Nunley W.E. presents an intriguing case study of a privately owned dam in Oklahoma that plays a vital role in managing water resources in the region. With its unique design and history dating back to the 1960s, this earth dam serves as a key infrastructure for flood control and water storage on TR Armstrong Creek. While its risk level is rated as very high, state regulatory agencies are actively involved in monitoring and ensuring the safety of the dam for the surrounding communities.
Year Completed |
1960 |
Dam Length |
330 |
Dam Height |
30 |
River Or Stream |
TR ARMSTRONG CREEK |
Primary Dam Type |
Earth |
Surface Area |
5 |
Hydraulic Height |
26 |
Nid Storage |
119 |
Structural Height |
30 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
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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.
Nunley W.E.