Lillard Dam Reservoir Report

Last Updated: December 13, 2025

Lillard Dam, located in Crook County, Oregon, stands as a vital structure for irrigation purposes along the Twelve Mile Creek, South Fork.


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Summary

Built in 1950, this private-owned earth dam stands at a height of 26.5 feet and stretches 562 feet in length, with a storage capacity of 840 acre-feet. The dam plays a crucial role in maintaining water supply for agricultural activities in the region, showcasing its importance in supporting local farming communities.

Despite its low hazard potential, Lillard Dam is regulated and inspected by the Oregon Water Resources Department to ensure its safety and functionality. With a needle outlet gate system and a maximum discharge capacity of 452 cubic feet per second, the dam is equipped to manage water flow efficiently. Though its condition assessment is currently not rated, regular inspections are conducted every six years to uphold its integrity and address any potential risks.

In the event of emergencies, the dam's emergency action plan status and risk assessment information remain undisclosed. However, the dam's presence serves as a critical asset for water resource management in the area, highlighting the significance of maintaining and monitoring such essential infrastructure for sustainable water supply and climate resilience.

Year Completed

1950

Dam Length

562

Dam Height

26

River Or Stream

TWELVE MILE CREEK, SOUTH FORK

Primary Dam Type

Earth

Surface Area

77

Hydraulic Height

21

Drainage Area

12

Nid Storage

840

Structural Height

26.5

Outlet Gates

Needle

Hazard Potential

Low

Nid Height

27
       
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.
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Area Campgrounds