Strong Arm No 1 (Upper) Reservoir Report

Last Updated: December 6, 2025

Strong Arm No 1 (Upper), also known as Treasureton Reservoir, is a private water resource located in Warm Springs, Idaho.


°F

°F

mph

Wind

%

Humidity

Summary

This dam was completed in 1887 and stands at a height of 39.1 feet, with a hydraulic height of 35.8 feet. It serves multiple purposes and has a storage capacity of 1713 acre-feet, providing essential water for the surrounding area. The dam is primarily made of earth and stone, with a controlled spillway type to manage water flow.

With a hazard potential rated as high and a condition assessment of fair, Strong Arm No 1 (Upper) is regularly inspected to ensure its structural integrity. The dam has a very high risk assessment level (1) and is under the jurisdiction of the Idaho Department of Water Resources. It has a drainage area of 29.9 square miles and a normal storage capacity of 1713 acre-feet, making it a crucial water source for the region. Despite its age, the dam continues to play a vital role in managing water resources and protecting against potential hazards in the area.

Year Completed

1887

Dam Length

480

Dam Height

39.1

River Or Stream

BATTLE CREEK BEAR RIVER

Surface Area

131

Hydraulic Height

35.8

Drainage Area

29.9

Nid Storage

1713

Outlet Gates

Slide (sluice gate)

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

39
       
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.