Stewart Gulch North Fork Reservoir Report

Last Updated: December 14, 2025

Stewart Gulch North Fork is a flood risk reduction structure located in Ada County, Idaho.


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Summary

Completed in 1997, this earth dam stands at a height of 38 feet and has a hydraulic height of 34 feet. With a storage capacity of 8 acre-feet and a maximum discharge of 440 cubic feet per second, this dam plays a crucial role in managing flood risks in the area.

The dam is situated on an unnamed stream called Stewart Gulch Creek, and it covers a drainage area of 0.6 square miles. Despite its significant hazard potential, the structure has been assessed as satisfactory in terms of condition. The last inspection in November 2018 reported that the dam meets regulatory standards and is in good working order, providing assurance to the local government and residents in the event of a flood emergency.

Managed by the Idaho Department of Water Resources, Stewart Gulch North Fork serves as a vital infrastructure for flood control in Boise. With its moderate risk assessment and satisfactory condition, this dam stands as a testament to the importance of water resource management and climate resilience in the face of changing environmental conditions.

Year Completed

1997

Dam Length

195

Dam Height

38

River Or Stream

UNNAMED STREAM STEWART GULCH CREEK

Surface Area

1

Hydraulic Height

34

Drainage Area

0.6

Nid Storage

8

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

38
       
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.