Antelope Canyon Detention Dam Reservoir Report
Last Updated: February 22, 2026
Antelope Canyon Detention Dam, located in Franklin, AZ, is a federal structure managed by the Bureau of Land Management in New Mexico.
Summary
Built in 1951, the dam's primary purpose is debris control along the Horseshoe Wash. It stands at a structural height of 34 feet with a hydraulic height of 26 feet, spanning a length of 1812 feet.
With a storage capacity of 676 acre-feet, the dam serves to mitigate flood risks in the region, with a low hazard potential and fair condition assessment as of the last inspection in 2013. The dam features an uncontrolled spillway and covers a surface area of 97.6 acres, providing important water resource management in the area. Despite its moderate risk assessment, the dam remains a vital infrastructure for controlling water flow and protecting the surrounding areas from potential flooding events.
°F
°F
mph
Wind
%
Humidity
15-Day Weather Outlook
Year Completed |
1951 |
Dam Length |
1812 |
River Or Stream |
Horseshoe Wash |
Surface Area |
97.6 |
Hydraulic Height |
26 |
Drainage Area |
17 |
Nid Storage |
676 |
Structural Height |
34 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
34 |
Seasonal Comparison
5-Day Hourly Forecast Detail
Nearby Streamflow Levels
Gila River Below Blue Creek
|
110cfs |
Gila River At Duncan
|
86cfs |
Gila River Near Redrock
|
105cfs |
Gila River Near Clifton
|
93cfs |
Gila River At Head Of Safford Valley
|
152cfs |
San Francisco River At Clifton
|
83cfs |
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.
Antelope Canyon Detention Dam
Gila