Alamo Dam Reservoir Report

Last Updated: May 3, 2026

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Alamo Dam, also known as Alamo Lake, is a federal-owned earth dam located on the Bill Williams River in Mohave County, Arizona.


Summary

Completed in 1968, the dam stands at 283 feet tall and has a storage capacity of 1,409,000 acre-feet. Its primary purpose is flood risk reduction, but it also serves as a recreational spot and fish and wildlife pond. The dam has a high hazard potential and was classified as a high risk in a 2020 assessment, primarily due to the potential for overtopping during extreme flood events, with estimated consequences on nearby communities in Arizona and California totaling over $2.5 billion.

To manage and mitigate the risks associated with Alamo Dam, the US Army Corps of Engineers (USACE) has implemented various measures. These include closely collaborating with federal, state, and local emergency managers, conducting regular emergency exercises, monitoring rainfall forecasts to anticipate high water events, and engaging with local communities to enhance flood preparedness. USACE also conducts regular inspections, instrument monitoring, and maintenance to ensure the dam's structural integrity and performance. Future risk communication activities involve updating the Emergency Action Plan, coordinating with first responders, and developing a formal Risk Communication Plan to keep the public informed and safe in case of emergencies. With these efforts, USACE aims to reduce the risk to the public and ensure the safety and resilience of Alamo Dam.

15-Day Long Term Forecast


Year Completed

1968

Dam Length

975

Dam Height

283

River Or Stream

BILL WILLIAMS RIVER

Primary Dam Type

Earth

Surface Area

41500

Hydraulic Height

278

Drainage Area

4770

Nid Storage

1409000

Hazard Potential

High

Nid Height

283
       
Seasonal Comparison

5-Day Hourly Forecast Detail

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.