Carnation Waste Pond No 7 Reservoir Report

Last Updated: December 13, 2025

Carnation Waste Pond No 7 is a privately owned offstream water storage structure located in Grant County, Washington.


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Summary

Constructed in 1979, this Earth-type dam stands at a hydraulic height of 16 feet with a structural height of 12 feet and a length of 1930 feet. It has a normal storage capacity of 71 acre-feet and a maximum storage of 99 acre-feet, serving as a critical resource for the area's water supply and management.

Managed by the Washington Department of Ecology, Carnation Waste Pond No 7 is subject to state regulation, inspection, and enforcement to ensure its safety and compliance with environmental standards. With a low hazard potential and a condition assessment of "Not Rated," this dam plays a vital role in water resource management in the region. While lacking detailed information on emergency preparedness and risk assessment, its purpose and design highlight the importance of sustainable water infrastructure for both human and environmental well-being.

As part of the Seattle District's water management system, Carnation Waste Pond No 7 contributes to the overall water quality and availability in the area. With its stone core and rock and soil foundations, this structure exemplifies the intersection of engineering and environmental stewardship in maintaining a balance between human needs and ecological sustainability. For water resource and climate enthusiasts, understanding the intricacies of such water management infrastructure sheds light on the complexities and challenges of ensuring a resilient and sustainable water future.

Year Completed

1979

Dam Length

1930

River Or Stream

Offstream

Primary Dam Type

Earth

Surface Area

20

Hydraulic Height

16

Drainage Area

3

Nid Storage

99

Structural Height

12

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

16
       
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.