Grandview Wastewater Lagoon F Dam Reservoir Report
Last Updated: December 15, 2025
Grandview Wastewater Lagoon F Dam, located in Yakima, Washington, is a significant structure owned by the local government and regulated by the Washington Department of Ecology.
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Summary
This buttress dam, completed in 1997, serves a primary purpose categorized as "Other," with a hydraulic height of 8.8 feet and a storage capacity of 128 acre-feet. The dam stands at a structural height of 8.8 feet and has a length of 100 feet, controlling the flow of the Yakima River.
The dam's condition was last assessed in July 2019 and deemed satisfactory, with a significant hazard potential. It undergoes inspection every five years to ensure its operational integrity and safety. The dam's Emergency Action Plan (EAP) was last revised in July 2019, aligning with guidelines for risk management and emergency preparedness. With a drainage area of 0.63 square miles, the Grandview Wastewater Lagoon F Dam plays a crucial role in water resource management in the region, highlighting the importance of maintaining and monitoring its condition for climate resilience and public safety.
As a key infrastructure in the water management system, Grandview Wastewater Lagoon F Dam stands as a testament to the collaborative efforts between local government agencies and state regulators to safeguard water resources and mitigate potential risks. With its storage capacity, structural design, and regulatory oversight, the dam serves as a vital component in ensuring water security in the Yakima area. As water resource and climate enthusiasts, understanding the significance of structures like the Grandview Dam underscores the importance of sustainable water management practices to address the challenges posed by changing environmental conditions.
Year Completed |
1997 |
Dam Length |
100 |
River Or Stream |
Yakima River |
Primary Dam Type |
Buttress |
Hydraulic Height |
8.8 |
Drainage Area |
0.63 |
Nid Storage |
128 |
Structural Height |
8.8 |
Hazard Potential |
Significant |
Nid Height |
9 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Yakima River At Mabton
|
19900cfs |
Granger Drain At Granger
|
13cfs |
Yakima River At Kiona
|
16300cfs |
Columbia River Below Priest Rapids Dam
|
115000cfs |
Umatilla River Near Umatilla
|
375cfs |
Yakima River Above Ahtanum Creek At Union Gap
|
11300cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Grandview Wastewater Lagoon F Dam