Nixon No 2 Reservoir Report

Last Updated: December 19, 2025

Nixon No 2, also known as Lower Nixon Dam, is a private-owned structure located in Boundary, Idaho, along Springs Bane Creek.


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Summary

This earth dam, primarily used for irrigation purposes, stands at a height of 12.7 meters with a storage capacity of 80.3 acre-feet. Despite its low hazard potential, the dam is in poor condition, as indicated by a 2016 assessment.

The dam features an uncontrolled spillway with a width of 6 meters and outlet gates consisting of slide (sluice gate) mechanisms. While it has not undergone significant modifications since its construction, Nixon No 2 is subject to state regulation, inspection, and enforcement by the Idaho Department of Water Resources. The risk assessment for the dam is rated as moderate (3), highlighting the need for ongoing monitoring and potential management measures to ensure its safety and functionality in the face of evolving climate conditions.

For water resource and climate enthusiasts, Nixon No 2 serves as a reminder of the intricate infrastructure supporting agricultural activities in the region and the importance of maintaining and upgrading such systems to withstand the impacts of changing environmental conditions. As a private dam under state jurisdiction, its management and upkeep are crucial for both water supply reliability and the safety of downstream communities. With its location in a remote area and limited associated structures, Nixon No 2 stands as a testament to the intersection of water resource management, infrastructure resilience, and climate adaptation in the face of potential hazards.

Dam Length

221

Dam Height

12.7

River Or Stream

SPRINGS BANE CREEK

Surface Area

19.5

Hydraulic Height

10.3

Drainage Area

1.3

Nid Storage

80.3

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

13
       
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.