Deer Flat East Dike Reservoir Report

Last Updated: December 15, 2025

Deer Flat East Dike, located in Canyon, Idaho, is a crucial water resource structure managed by the Bureau of Reclamation for irrigation purposes.


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Summary

Completed in 1911, this earth dam stands at 18 feet high and spans a length of 3806 feet, holding a maximum storage capacity of 159,365 acre-feet. Situated on the Boise River OS, the dam plays a key role in providing water for agricultural activities in the region.

With a low hazard potential and a high risk assessment rating of 2, Deer Flat East Dike is regularly inspected and regulated by the Bureau of Reclamation to ensure its structural integrity and operational efficiency. Despite having no spillway, the dam's design features an arch core supported by a rock foundation, contributing to its stability and reliability. Additionally, the dam's emergency action plan was last revised in July 2017, emphasizing the importance of preparedness and risk management in the event of a water-related emergency.

As a significant water management infrastructure in Idaho, Deer Flat East Dike serves as a critical component of the region's water supply system, demonstrating the importance of effective monitoring and maintenance practices to safeguard against potential risks and ensure sustainable water resource management for future generations.

Year Completed

1911

Dam Length

3806

Dam Height

18

River Or Stream

BOISE RIVER OS

Primary Dam Type

Earth

Surface Area

10100

Hydraulic Height

10

Drainage Area

92

Nid Storage

159365

Structural Height

18

Hazard Potential

Low

Foundations

Rock

Nid Height

18
       
Seasonal Comparison

Weather Forecast

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.