Green Ab Reservoir Report
Nearby: Oknoname 087036 Mccurdy Wc
Last Updated: December 14, 2025
Green Ab is a privately owned dam located in McClain, Oklahoma, near the city of Purcell.
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Summary
Built in 1960, this earth dam stands at a height of 23 feet and has a length of 980 feet, creating a reservoir with a storage capacity of 190 acre-feet. The dam is regulated by the Oklahoma Water Resources Board and is subject to state permitting, inspection, and enforcement.
The primary purpose of Green Ab is categorized as "Other," with a low hazard potential and a very high risk assessment rating of 1. The dam features a controlled spillway and a single valve outlet gate. While the dam is not currently rated for its condition, it undergoes inspections every five years. Despite its condition assessment status, Green Ab is considered to have a very high risk level, emphasizing the importance of ongoing monitoring and maintenance to ensure its safety and functionality.
Located on the TR-Walnut Creek, Green Ab plays a crucial role in managing water resources in the region and serves as a key piece of infrastructure for flood control and water supply. With its strategic location and design features, Green Ab represents a significant asset in the management of water resources in McClain County, Oklahoma.
Year Completed |
1960 |
Dam Length |
980 |
Dam Height |
23 |
River Or Stream |
TR-WALNUT CREEK |
Primary Dam Type |
Earth |
Surface Area |
13 |
Hydraulic Height |
23 |
Nid Storage |
190 |
Structural Height |
23 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
23 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Walnut Creek At Purcell
|
29cfs |
Canadian River At Purcell
|
197cfs |
North Criner Creek Near Criner
|
1cfs |
Canadian River At Norman
|
213cfs |
Washita River Near Pauls Valley
|
317cfs |
Washita River At Alex
|
229cfs |
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.
Green Ab