Sunnyside Mp 37.1 Reservoir Reservoir Report
Nearby: Den Hoed Dam No 1 Avalon Fruit Dam 5
Last Updated: December 14, 2025
The Sunnyside Mp 37.1 Reservoir is a key water resource infrastructure in Yakima, Washington, designed by CH2M Hill and completed in 2011.
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Summary
This public utility reservoir serves primarily for irrigation purposes, with a storage capacity of 438 acre-feet and a surface area of 26.6 acres. Situated along the Sulphur Creek Wasteway, this earth dam structure stands at a hydraulic height of 28 feet, providing vital water supply to the surrounding agricultural lands.
Managed by the Washington Dept of Ecology, the Sunnyside Mp 37.1 Reservoir is state-regulated and undergoes regular inspections to ensure its fair condition and high hazard potential are properly addressed. With a drainage area of 0.04 square miles, this reservoir plays a crucial role in the water management system of the region. The congressional district 04 representative, Dan Newhouse (R), oversees the area, ensuring that the reservoir meets safety guidelines and emergency preparedness protocols.
Water resource and climate enthusiasts will be intrigued by the Sunnyside Mp 37.1 Reservoir's essential role in supporting irrigation in Yakima, Washington. With a focus on sustainable water management and regulatory compliance, this reservoir stands as a vital piece of infrastructure in the region, serving as a lifeline for agricultural activities and water supply reliability. The reservoir's capacity, design characteristics, and regulatory oversight make it a noteworthy asset in the efforts to secure water resources in the face of changing climate conditions.
Year Completed |
2011 |
River Or Stream |
Sulphur Creek Wasteway |
Primary Dam Type |
Earth |
Surface Area |
26.6 |
Hydraulic Height |
28 |
Drainage Area |
0.04 |
Nid Storage |
438 |
Structural Height |
28 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Yakima River At Mabton
|
28900cfs |
Granger Drain At Granger
|
13cfs |
Columbia River Below Priest Rapids Dam
|
124000cfs |
Yakima River At Kiona
|
23800cfs |
Yakima River Above Ahtanum Creek At Union Gap
|
14200cfs |
Ahtanum Creek At Union Gap
|
197cfs |
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.
Sunnyside Mp 37.1 Reservoir