Grandview Wastewater Lagoon Dam Reservoir Report
Last Updated: December 15, 2025
The Grandview Wastewater Lagoon Dam, located in Yakima, Washington, is a significant structure owned by the local government and regulated by the Washington Dept of Ecology.
°F
°F
mph
Wind
%
Humidity
Summary
Completed in 1991, this buttress dam stands at a hydraulic height of 7 feet and has a maximum storage capacity of 85 acre-feet. With a drainage area of 0.02 square miles, it serves a vital role in managing wastewater and maintaining water resources in the region.
Despite its satisfactory condition assessment as of July 2019, the Grandview Wastewater Lagoon Dam poses a significant hazard potential due to its location and the volume of water it holds. It is subject to regular inspections every 5 years to ensure its structural integrity and operational effectiveness. Emergency action plans are in place to address any potential risks, although specific details on measures and guidelines are not provided in the available data.
As an offstream structure with a primary purpose designated as "Other," the Grandview Wastewater Lagoon Dam plays a crucial role in water management and environmental protection efforts in the area. Its presence and functionality contribute to the overall resilience of the watershed and support the sustainable use of water resources in Yakima, Washington.
Year Completed |
1991 |
Dam Length |
225 |
River Or Stream |
Offstream |
Primary Dam Type |
Buttress |
Surface Area |
12 |
Hydraulic Height |
7 |
Drainage Area |
0.02 |
Nid Storage |
85 |
Structural Height |
7 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
7 |
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 Dam