Momtazi - Reservoir #2 Reservoir Report

Last Updated: December 13, 2025

Momtazi - Reservoir #2, also known as Oldsville Road Dam, is a privately owned earth dam located in Yamhill, Oregon.


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Summary

Built in 2000 by H & R Engineering, this dam stands at a height of 39 feet and has a storage capacity of 81 acre-feet. Despite being classified as having a low hazard potential, it is regulated and inspected by the Oregon Water Resources Department.

Situated on the unnamed tributary of the South Yamhill River, Momtazi - Reservoir #2 serves a primary purpose of "Other" and features a slide (sluice gate) outlet gate for water release. The dam does not have a spillway, but its uncontrolled spillway type suggests a carefully managed water discharge system. While the condition assessment of the dam is currently listed as "Not Rated," its risk assessment is moderate, indicating a need for ongoing monitoring and management.

For water resource and climate enthusiasts, Momtazi - Reservoir #2 presents an intriguing case study in private dam ownership and regulation. With its unique design and operational features, this earth dam offers a glimpse into the complexities of managing water resources in Oregon. As stakeholders work to ensure the safety and sustainability of this structure, it serves as a reminder of the vital role that dams play in our environment and communities.

Year Completed

2000

Dam Height

39

River Or Stream

UNNAMED, TRIB/SOUTH YAMHILL RIVER

Primary Dam Type

Earth

Nid Storage

81

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Foundations

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.