Summary
Built in 1911, this masonry dam stands at a height of 48 feet and spans a length of 596 feet, providing a reservoir with a storage capacity of 247 acre-feet for purposes such as fish and wildlife habitat, fire protection, and recreation. The dam is regulated by the Arizona Department of Water Resources and is inspected regularly to ensure its structural integrity.
Despite its age, Masonry #2 has been assessed as being in satisfactory condition, with a high hazard potential due to its location and the volume of water it holds. The dam features an uncontrolled spillway and is classified as a multi-arch masonry structure built on a rock foundation. With a surface area of 15 acres and a drainage area of 29.5 square miles, the dam plays a crucial role in managing water resources in the region and supporting the local ecosystem.
While Masonry #2 poses a moderate risk level and has not been modified in recent years, it remains a key component of the area's infrastructure for maintaining water supply and supporting wildlife. As a fish and wildlife pond, the dam serves as a vital resource for the community and highlights the intersection of water management, climate resilience, and environmental conservation in the region.
Year Completed |
1911 |
Dam Length |
596 |
Dam Height |
48 |
River Or Stream |
JOHNSON CANYON |
Primary Dam Type |
Masonry |
Surface Area |
15 |
Drainage Area |
29.5 |
Nid Storage |
247 |
Structural Height |
50.5 |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
51 |
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.
Masonry #2