Antelope Creek Reservoir Report

Last Updated: December 13, 2025

Antelope Creek is a privately owned irrigation structure located in Idaho, specifically in Bonneville County.


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Summary

Completed in 1991, this earth dam stands at a height of 21.8 feet and has a maximum storage capacity of 67 acre-feet. With a surface area of 10.1 acres, Antelope Creek serves the primary purpose of irrigation, providing water resources for agricultural activities in the region.

Managed by the Idaho Department of Water Resources, Antelope Creek is regulated, inspected, and enforced for compliance with state regulations. The dam, constructed with stone core and rock and soil foundations, features a controlled spillway with a width of 16 feet. Classified as having a significant hazard potential and fair condition assessment, the structure undergoes inspections every four years to ensure its safety and integrity. The risk assessment for Antelope Creek indicates a very high risk level, emphasizing the importance of ongoing maintenance and monitoring to mitigate potential hazards.

Situated within the Snake River drainage area, Antelope Creek plays a vital role in supporting the local agricultural community by providing reliable irrigation water. Despite its risk assessment, the dam continues to serve its purpose effectively, demonstrating the importance of water resource management and infrastructure maintenance in the face of changing climate conditions. For water resource and climate enthusiasts, Antelope Creek represents a prime example of the intricate balance between human intervention and natural systems in sustaining agricultural activities in the region.

Year Completed

1991

Dam Length

350

Dam Height

21.8

River Or Stream

ANTELOPE CREEK SNAKE RIVER

Surface Area

10.1

Hydraulic Height

16.6

Nid Storage

67

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

22
       
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.