Conner Jarvis East Pond Reservoir Report

Last Updated: December 15, 2025

Conner Jarvis East Pond, located in King County, Washington, is a flood risk reduction structure designed and regulated by the Washington Dept of Ecology.


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Summary

Completed in 2018, this earth dam stands at a hydraulic height of 7 feet and spans a length of 1230 feet. With a storage capacity of 13 acre-feet, it serves the primary purpose of mitigating flood risks in the area.

The dam's condition assessment in June 2018 deemed it in satisfactory condition, with a significant hazard potential. Regular inspections are conducted every 5 years to ensure its continued functionality and safety. Despite its critical role in flood risk reduction, the structure has not been modified since its completion and lacks detailed risk management measures.

Water resource and climate enthusiasts interested in the intersection of infrastructure and environmental protection will find Conner Jarvis East Pond to be a valuable case study. Its location, design details, and regulatory oversight offer insights into the complexities of managing water resources in a changing climate. Further research and analysis could uncover opportunities for enhancing the dam's resilience and effectiveness in safeguarding the community from flood events.

Year Completed

2018

Dam Length

1230

Primary Dam Type

Earth

Hydraulic Height

7

Drainage Area

0.03

Nid Storage

13

Structural Height

7

Hazard Potential

Significant

Nid Height

7
       
Seasonal Comparison

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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.