North Cove Creek Reservoir Report

Last Updated: December 15, 2025

North Cove Creek, also known as Swain Number One, is a private water resource located in Weiser, Idaho.


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Summary

Built in 1975 for irrigation purposes, this earth dam stands at a height of 26.4 feet and has a storage capacity of 94 acre-feet. With a low hazard potential and fair condition assessment, North Cove Creek serves as a vital source of water for the surrounding area.

Managed by the Idaho Department of Water Resources, this dam on Cove Creek, a tributary of the Weiser River, covers a surface area of 14 acres and has a drainage area of 1.6 square miles. Its uncontrolled spillway allows for a maximum discharge of 440 cubic feet per second. Despite its moderate risk assessment, North Cove Creek is regularly inspected and regulated to ensure its safe operation and water storage capabilities.

Located within the Walla Walla District, North Cove Creek plays a crucial role in providing irrigation water for agricultural purposes in the region. With its stone core and rock-soil foundations, this dam continues to support the local community while maintaining a balance between water resource management and environmental conservation.

Year Completed

1975

Dam Length

425

Dam Height

26.4

River Or Stream

COVE CREEK WEISER RIVER

Surface Area

14

Hydraulic Height

20.6

Drainage Area

1.6

Nid Storage

94

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

26
       
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.