Ennis Creek Dam Reservoir Report

Last Updated: December 13, 2025

Ennis Creek Dam, also known as J-Spear Ranch Dam, is a privately owned structure located in Lake County, Oregon.


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Summary

This earth dam was primarily built for irrigation purposes and stands at a height of 27 feet, with a storage capacity of 27 acre-feet. While the dam is regulated by the state and subject to inspection, its hazard potential is classified as low, and its condition assessment is currently not rated.

Despite its small size and low hazard potential, Ennis Creek Dam plays a crucial role in water resource management in the area. Its presence ensures a reliable water supply for agricultural activities, highlighting the importance of such structures in sustaining local ecosystems and economies. The dam's location within the Portland District underscores its significance within the broader network of water infrastructure in the region.

With its last inspection dating back to July 2011, Ennis Creek Dam serves as a reminder of the ongoing maintenance and monitoring required to ensure the safety and effectiveness of water storage and distribution systems. As climate change continues to impact water resources, structures like Ennis Creek Dam will play an increasingly vital role in adapting to changing conditions and securing water supplies for future generations.

Dam Height

27

Primary Dam Type

Earth

Surface Area

2

Nid Storage

27

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.