Bradshaw Detention Dam #4 Reservoir Report

Last Updated: December 5, 2025

Bradshaw Detention Dam #4, located in Idaho along the Bradshaw Gulch, was completed in 1967 to primarily serve as a flood risk reduction structure.


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Summary

This gravity dam has a hydraulic height of 43 feet and a structural height of 49 feet, with a storage capacity of 120 acre-feet. The dam is owned, funded, designed, constructed, regulated, inspected, and operated by the Bureau of Land Management, showcasing federal involvement in its management.

With a low hazard potential and a moderate risk assessment rating, Bradshaw Detention Dam #4 has not been rated for its current condition. The dam features an uncontrolled spillway with a width of 2 feet and has not been modified in recent years. While the last inspection took place in 2007, the dam's emergency action plan status, inundation maps, risk management measures, and other related aspects remain unlisted, highlighting potential areas for improvement in the future.

Overall, Bradshaw Detention Dam #4 stands as a key infrastructure for flood risk reduction in the region, showcasing federal agency oversight and involvement. As water resource and climate enthusiasts, further updates on the dam's condition, risk management measures, and emergency preparedness would provide valuable insights into its ongoing effectiveness in safeguarding the surrounding area from potential flooding events.

Year Completed

1967

Dam Length

446

River Or Stream

BRADSHAW GULCH

Primary Dam Type

Gravity

Surface Area

21

Hydraulic Height

43

Drainage Area

10.2

Nid Storage

120

Structural Height

49

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

49
       
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.