Crane Gulch East Dam Reservoir Report

Last Updated: December 14, 2025

Crane Gulch East Dam, located in Boise, Idaho, is a local government-owned structure designed by Morrison Knudsen Corp and regulated by the Idaho Department of Water Resources.


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Summary

Completed in 1998, this earth dam stands at a height of 60.4 feet and serves the primary purpose of flood risk reduction along the unnamed stream Crane Creek. With a storage capacity of 28 acre-feet and a maximum discharge of 1900 cubic feet per second, the dam plays a crucial role in managing water resources in the area.

The dam's spillway, with a width of 150 feet, is uncontrolled, and it has been assessed to have a significant hazard potential but with a satisfactory condition as of the last inspection in November 2018. The dam's risk assessment is moderate, with a DSAC (Dam Safety Action Classification) assigned date yet to be determined. While the structure does not have outlet gates, its drainage area of 2.3 square miles and surface area of 2 acres contribute to its effective flood risk reduction capabilities. As water resource and climate enthusiasts, understanding the design, function, and regulatory oversight of Crane Gulch East Dam offers valuable insights into its role in water management within the Ada County region.

Overall, Crane Gulch East Dam stands as a vital infrastructure component in the region's water resource management efforts, showcasing the collaboration between local government, design firms, and regulatory agencies. As enthusiasts interested in the intersection of water resources and climate, the dam's specifications, maintenance history, and risk assessment provide valuable information on its contribution to flood risk reduction and environmental stewardship. Stay tuned for updates on the dam's operations, inspections, and any future modifications that may enhance its effectiveness in safeguarding the surrounding communities against potential water-related hazards.

Year Completed

1998

Dam Length

316

Dam Height

60.4

River Or Stream

UNNAMED STREAM CRANE CREEK

Surface Area

2

Hydraulic Height

56

Drainage Area

2.3

Nid Storage

28

Outlet Gates

None

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

60
       
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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.