J-Canal Reregulating Reservoir Report

Last Updated: December 13, 2025

Located in Cassia, Idaho, the J-Canal Reregulating structure serves as a vital component in managing water resources for the surrounding area.


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Summary

Completed in 1994, this earth dam stands at a height of 18.5 feet and has a hydraulic height of 14.5 feet. With a storage capacity of 25 acre-feet, it plays a crucial role in regulating water flow for the unnamed stream it serves.

With a spillway width of 40 feet and a maximum discharge capacity of 150 cubic feet per second, the J-Canal Reregulating structure is designed to handle significant water flow and potential hazards. Despite its age, the dam is reported to be in satisfactory condition as of the last assessment in July 2017. The structure is state-regulated and permitted, with inspections conducted regularly to ensure its continued safety and effectiveness in water management.

For water resource and climate enthusiasts, the J-Canal Reregulating structure offers a fascinating glimpse into the intricate systems and structures that help manage and control water flow in Idaho. Its strategic location, design features, and purpose make it a key player in ensuring the efficient distribution and regulation of water resources for the local community. As discussions around water management and climate change continue to evolve, structures like the J-Canal Reregulating serve as essential components in safeguarding water security and sustainability for the future.

Year Completed

1994

Dam Length

450

Dam Height

18.5

River Or Stream

UNNAMED STREAM SINKS

Surface Area

5

Hydraulic Height

14.5

Drainage Area

1.2

Nid Storage

25

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

19
       
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.