Little Park Dam Reservoir Report

Last Updated: December 13, 2025

Little Park Dam, also known as Fisk Reservoir, is a private-owned structure located in Union, Oregon.


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Summary

Completed in 1958, this earth-type dam stands at a height of 31 feet and serves primarily for irrigation purposes along Thorn Creek. With a storage capacity of 320 acre-feet and a surface area of 33.5 acres, the dam plays a crucial role in water resource management in the region.

Managed by the Natural Resources Conservation Service, Little Park Dam is regulated by the Oregon Water Resources Department and undergoes regular inspections to ensure its safety and functionality. With a significant hazard potential and a condition assessment that is currently not rated, the dam poses both challenges and opportunities for water resource and climate enthusiasts interested in sustainable water management practices. The dam's location in the Portland District and its historical significance make it a focal point for ongoing discussions on dam safety and risk management in the area.

As climate change continues to impact water resources globally, the maintenance and regulation of dams like Little Park Dam are essential for ensuring water security and resilience in the face of evolving climatic conditions. With its vital role in supporting irrigation activities and water storage along Thorn Creek, Little Park Dam remains a key infrastructure for both local agriculture and environmental conservation efforts in Union, Oregon.

Year Completed

1958

Dam Length

510

Dam Height

31

River Or Stream

THORN CREEK

Primary Dam Type

Earth

Surface Area

33.5

Hydraulic Height

29

Drainage Area

0.4

Nid Storage

320

Structural Height

32

Hazard Potential

Significant

Nid Height

32
       
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.