Lower Chalk Tank Reservoir Report
Nearby: Upper Chalk Tank Crow Tank
Last Updated: December 15, 2025
Lower Chalk Tank, located in Cochise, Arizona, is a privately owned earth dam completed in 2002 for fire protection, stock, and small fish pond purposes.
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Summary
With a dam height of 22.4 feet and a storage capacity of 54.3 acre-feet, this tank serves a vital role in water resource management in the area. The dam's low hazard potential and moderate risk assessment make it a reliable asset for the community.
Managed by the Arizona Department of Water Resources, Lower Chalk Tank is subject to state regulation, permitting, inspection, and enforcement to ensure its safety and functionality. Despite not being rated for condition assessment, the tank has a history of regular inspections, with the last one conducted in December 2010. The tank's location in a remote area with unknown river or stream connections highlights its importance in providing water resources for local wildlife and firefighting efforts.
Overall, Lower Chalk Tank stands as a valuable water resource infrastructure in Arizona, contributing to water storage, fire protection, and ecological support in the region. Its strategic location, design, and management by state authorities make it a crucial component in sustaining water availability and climate resilience in Cochise County.
Year Completed |
2002 |
Dam Length |
650 |
Dam Height |
22.4 |
River Or Stream |
UNKNOWN |
Primary Dam Type |
Earth |
Surface Area |
7.3 |
Drainage Area |
2.9 |
Nid Storage |
54.3 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
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.
Lower Chalk Tank