Foster Reservoir Report

Last Updated: December 5, 2025

Located in Franklin, Idaho, the Foster dam serves as a crucial irrigation structure for the surrounding area.


°F

°F

mph

Wind

%

Humidity

Summary

Built in 1962, this earth dam stands at a height of 70 feet and has a storage capacity of 2969 acre-feet, providing water for agricultural purposes. The dam is situated on Worm Creek and Cub River, and is regulated by the Idaho Department of Water Resources.

Despite its fair condition assessment, Foster dam poses a high hazard potential, emphasizing the importance of regular inspections and maintenance. The dam has a spillway type of "None", indicating a potential risk in case of excessive water flow. In the event of an emergency, the dam lacks an Emergency Action Plan (EAP) and updated contact information, highlighting the need for improved risk management measures.

With its significant role in irrigation and high risk potential, the Foster dam underscores the critical intersection of water resource management and climate resilience. As water enthusiasts and climate advocates, it is essential to prioritize the safety and maintenance of such infrastructure to ensure the sustainable use of water resources in the face of changing environmental conditions.

Year Completed

1962

Dam Length

1300

Dam Height

70

River Or Stream

WORM CREEK CUB RIVER

Surface Area

145

Hydraulic Height

65

Drainage Area

1.2

Nid Storage

2969

Outlet Gates

Valve

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

70
       
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.