Martin Bros. Flashboard Dam Reservoir Report

Last Updated: December 13, 2025

Martin Bros.


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Summary

Flashboard Dam, located in Polk County, Oregon, serves as a crucial water resource for irrigation purposes. Constructed in 1973 by the Natural Resources Conservation Service, this private dam stands at a height of 10.5 feet and has a storage capacity of 71 acre-feet. Positioned on the Ash Swale tributary, the dam plays a vital role in managing water flow and ensuring a stable water supply for agricultural activities in the area.

With a low hazard potential, Martin Bros. Flashboard Dam is regularly inspected by the Oregon Water Resources Department to ensure its structural integrity and safety. The dam's spillway capacity of 97 cubic feet per second contributes to flood control measures and protects downstream areas from potential inundation. Despite its age, the dam continues to fulfill its primary purpose of facilitating irrigation and supporting the local agricultural community in Amity.

As a key feature in the water management infrastructure of the region, Martin Bros. Flashboard Dam stands as a testament to the importance of sustainable water resource practices. Its strategic location and efficient design make it a valuable asset for water conservation efforts, showcasing the crucial role that private dams play in maintaining a reliable water supply in the face of changing climate conditions.

Year Completed

1973

Dam Length

305

Dam Height

10

River Or Stream

ASH SWALE, TRIB TO

Primary Dam Type

Other

Surface Area

7

Hydraulic Height

8

Drainage Area

3.53

Nid Storage

71

Structural Height

10.5

Hazard Potential

Low

Nid Height

11
       
Seasonal Comparison

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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.