Johnny Crabb Reservoir Report
Nearby: Johnny Crabb Dam Jl Briscoe Dam
Last Updated: December 21, 2025
Johnny Crabb is a privately owned dam located in Greer County, Oklahoma, along the Red River.
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Summary
Built in 1985 by the NRCS, this earth dam stands at a height of 25.6 feet and has a storage capacity of 84.5 acre-feet. It serves a primary purpose of "Other" and is regulated by the Oklahoma Water Resources Board, with state permitting, inspection, and enforcement in place.
With a low hazard potential and a very high risk assessment rating of 1, Johnny Crabb is considered to be in good condition, although it has not been officially rated. The dam features a controlled spillway with a width of 1 foot and a single valve outlet gate. The last inspection was conducted in November 2010, with a frequency of every 5 years. Despite the lack of an Emergency Action Plan (EAP) or inundation maps, the dam continues to provide essential water resource management functions for the region.
Johnny Crabb's location within the Tulsa District of Oklahoma and its association with the Red River make it a key structure for water resource and climate enthusiasts to monitor. With its historical significance, ongoing regulatory oversight, and critical risk assessment, this dam serves as a focal point for understanding the intersection of water management, infrastructure development, and environmental stewardship in the region.
Year Completed |
1985 |
Dam Height |
25.6 |
River Or Stream |
RED RIVER |
Primary Dam Type |
Earth |
Drainage Area |
0.62 |
Nid Storage |
84.5 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Nid Height |
26 |
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