Foster Log Pond Reservoir Report

Last Updated: December 13, 2025

Foster Log Pond, also known as Willamette National Log Pond, is a privately owned water storage facility located in Linn County, Oregon.


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Summary

Built in 1946, this Earth dam stands at 17 feet tall and has a storage capacity of 375 acre-feet. Situated along the South Santiam River, the pond covers a surface area of 57 acres and serves multiple purposes beyond just water storage.

With a high hazard potential and fair condition assessment, Foster Log Pond is regularly inspected by the Oregon Water Resources Department to ensure its structural integrity and safety. Equipped with slide gates for outlet control, this dam plays a crucial role in managing water flow and storage for its surrounding area. While it may not have a spillway or locks, its strategic location and design make it a significant feature in the local water resource infrastructure.

For water resource and climate enthusiasts, Foster Log Pond offers a glimpse into the intricate network of dams and reservoirs that contribute to water management in Oregon. Its presence along the South Santiam River highlights the importance of these structures in regulating water flow, mitigating flood risks, and supporting various environmental and agricultural activities in the region. As a privately owned facility with state regulation and inspection, Foster Log Pond exemplifies the collaboration between private entities and government agencies to ensure sustainable water resource management in the face of changing climate conditions.

Year Completed

1946

Dam Length

2450

Dam Height

17

River Or Stream

SOUTH SANTIAM RIVER

Primary Dam Type

Earth

Surface Area

57

Hydraulic Height

15

Drainage Area

0.12

Nid Storage

375

Structural Height

19

Outlet Gates

Slide (sluice gate)

Hazard Potential

High

Nid Height

19
       
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.