Johnny Crabb Dam Reservoir Report
Nearby: Johnny Crabb Jl Briscoe Dam
Last Updated: December 21, 2025
Johnny Crabb Dam, located in Greer, Oklahoma, is a privately owned structure designed by NRCS for the primary purpose of water resource management.
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Summary
This earth dam stands at a height of 12.4 feet and has a storage capacity of 120 acre-feet, with a normal storage level of 23.5 acre-feet. The dam regulates an unnamed creek that is a tributary to the Salt Fork Red River, making it an essential part of the local water infrastructure.
Managed by the Oklahoma Water Resources Board, Johnny Crabb Dam is classified as having a low hazard potential but a very high risk assessment, indicating potential vulnerabilities that may require further attention. Despite not having a condition rating, the dam undergoes inspections every 5 years to ensure its structural integrity and safety. With a controlled spillway and a single outlet valve, the dam plays a crucial role in flood control and water supply management in the region.
For water resource and climate enthusiasts, Johnny Crabb Dam offers a fascinating case study in private ownership and state regulation of vital water infrastructure. Its location and design highlight the intricate balance between water conservation, risk management, and regulatory oversight in safeguarding our natural resources for future generations.
Dam Height |
12.4 |
River Or Stream |
UNNAMED CREEK TRI. SALT FORK RED RIVER |
Primary Dam Type |
Earth |
Drainage Area |
0.23 |
Nid Storage |
120 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Nid Height |
12 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Johnny Crabb Dam