Cone Johnson Dam Reservoir Report
Nearby: North Tule Dam Cosby Lake Dam
Last Updated: December 19, 2025
Cone Johnson Dam, located in Castro County, Texas, serves primarily for irrigation purposes on the North Tule Draw river.
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Summary
Built in 1971, this earth dam stands at a height of 17 feet and stretches 570 feet in length, with a storage capacity of 372 acre-feet. Despite its age, the dam's condition remains unrated, and its hazard potential is not available, making it a subject of interest for water resource and climate enthusiasts.
With no spillway and a single outlet gate, Cone Johnson Dam presents a unique engineering design that caters to the surrounding agricultural and irrigation needs. The dam's lack of state regulation, enforcement, and oversight poses a challenge in terms of risk management and emergency preparedness, highlighting the importance of monitoring and maintaining critical infrastructure in the face of changing environmental conditions.
As a structure managed by a private owner and outside federal jurisdiction, Cone Johnson Dam embodies the delicate balance between water resource management and climate resilience at the local level. Its modest height and storage capacity underscore the critical role of small-scale dams in sustaining rural communities and agricultural activities, highlighting the need for continued monitoring and assessment to ensure their safety and effectiveness in the face of evolving climate challenges.
Year Completed |
1971 |
Dam Length |
570 |
Dam Height |
17 |
River Or Stream |
NORTH TULE DRAW |
Primary Dam Type |
Earth |
Hydraulic Height |
17 |
Nid Storage |
372 |
Structural Height |
17 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
17 |
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.
Cone Johnson Dam