Idc-Effluent Storage Reservoir Report

Last Updated: December 14, 2025

Idc-Effluent Storage is a state-regulated water storage facility located in Ada, Idaho, with a primary purpose of irrigation.


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Summary

This earth dam, constructed in 1998, stands at a height of 23 feet, with a hydraulic height of 20 feet and a length of 3125 feet. It has a storage capacity of 105 acre-feet and covers a surface area of 13 acres, serving the surrounding area with water from the SPRING TENMILE CREEK. The dam, built on rock and soil foundations, is equipped with other controlled outlet gates for water release.

Despite its satisfactory condition assessment as of December 2020, Idc-Effluent Storage poses a significant hazard potential, with a high risk assessment rating of 2. Regular inspections are conducted, with an inspection frequency of 4 times per year to ensure the safety and efficiency of the structure. While there are no spillways or locks associated with the dam, it remains an essential component of the local water management system and contributes significantly to the irrigation needs of the region. With its location in a remote area and its critical role in water resource management, Idc-Effluent Storage plays a crucial role in sustaining agricultural activities in the surrounding area.

Year Completed

1998

Dam Length

3125

Dam Height

23

River Or Stream

SPRING TENMILE CREEK

Surface Area

13

Hydraulic Height

20

Drainage Area

0.1

Nid Storage

105

Outlet Gates

Other Controlled

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

23
       
Seasonal Comparison

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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.