Updegrave Reservoir Report

Last Updated: December 12, 2025

Updegrave is a privately owned dam located in Winchester, Douglas County, Oregon.


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Summary

Completed in 1957, this Earth dam stands at 30 feet high and serves primarily for irrigation purposes along the North Umpqua River. With a storage capacity of 172 acre-feet and a surface area of 13.94 acres, Updegrave plays a crucial role in managing water resources in the area.

The dam's high hazard potential is closely monitored by the Oregon Water Resources Department, which regulates its operations, conducts regular inspections, and enforces safety measures. With a satisfactory condition assessment as of November 2020, Updegrave is equipped with Needle outlet gates and has a maximum discharge capacity of 90 cubic feet per second. Its location within the Portland District underscores the importance of this structure in supporting agricultural activities and water management in the region.

As a key component of the local water infrastructure, Updegrave represents a significant investment in enhancing water supply reliability for irrigation purposes. Despite its high hazard potential, the dam's satisfactory condition and regulatory oversight by the OWRD ensure that it continues to contribute to the sustainable utilization of water resources in the North Umpqua River watershed. With its role in water storage and management, Updegrave stands as a testament to the intersection of water resource management and climate resilience in Oregon's agricultural landscape.

Year Completed

1957

Dam Length

400

Dam Height

30

River Or Stream

NORTH UMPQUA RIVER, TRIB TO

Primary Dam Type

Earth

Surface Area

13.94

Hydraulic Height

28

Drainage Area

0.86

Nid Storage

172

Structural Height

35

Outlet Gates

Needle

Hazard Potential

High

Nid Height

35
       
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.