Amity Hills Dam Reservoir Report

Last Updated: December 13, 2025

Amity Hills Dam, located in Yamhill, Oregon, stands as a key structure for irrigation purposes in the region.


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Summary

Designed by VERBOORT/STUNTZNER, this private-owned Earth dam reaches a height of 32 feet and boasts a storage capacity of 125 acre-feet. Situated on the UNNAMED tributary of Ash Swale, the dam is regulated by the Oregon Water Resources Department and undergoes regular inspections to ensure its safety and functionality.

With a spillway type identified as Uncontrolled and outlet gates designed as Needle, Amity Hills Dam poses a significant hazard potential, with a moderate risk assessment rating of 3. Despite its condition being labeled as Not Rated, the dam's risk management measures are not specified. The last inspection conducted in October 2018 revealed no major issues, indicating the dam's stability in the face of potential emergencies.

As water resource and climate enthusiasts delve into the intricacies of Amity Hills Dam, its role in supporting irrigation activities and water storage in the region becomes increasingly apparent. The dam's presence underscores the importance of infrastructure maintenance and regulatory oversight in safeguarding water resources for present and future generations.

Dam Height

32

River Or Stream

UNNAMED, TRIB/ASH SWALE

Primary Dam Type

Earth

Nid Storage

125

Outlet Gates

Needle

Hazard Potential

Significant

Nid Height

32
       
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.