Indian Creek Dam Reservoir Report

Last Updated: December 13, 2025

Indian Creek Dam, located in Ilwaco, Washington, is a crucial water supply structure owned by the local government and regulated by the Washington Department of Ecology.


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Summary

Completed in 1989, this earth-type dam stands at a hydraulic height of 60 feet and a structural height of 73 feet, with a length of 750 feet. It serves the primary purpose of water supply, with a storage capacity of 1050 acre-feet and a normal storage of 856 acre-feet.

Despite its importance, Indian Creek Dam poses a high hazard potential due to its poor condition assessment as of March 2018. With a high risk of failure, regular inspections are conducted every five years to ensure public safety. The dam's emergency action plan was last updated in September 2020, and measures are in place to manage potential risks. It is crucial for water resource and climate enthusiasts to monitor the condition and regulatory status of Indian Creek Dam to mitigate any potential hazards and ensure the sustainable management of water resources in the region.

Year Completed

1989

Dam Length

750

River Or Stream

Indian Creek

Primary Dam Type

Earth

Surface Area

35

Hydraulic Height

60

Drainage Area

856

Nid Storage

1050

Structural Height

73

Hazard Potential

High

Foundations

Soil

Nid Height

73
       
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.