Baby Gap Ranch Reservoir Reservoir Report
Nearby: Gap Road Reservoir Prosser Diversion
Last Updated: December 15, 2025
Baby Gap Ranch Reservoir, located in Prosser, Washington, is a privately owned irrigation reservoir on the Yakima River.
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Summary
Completed in 2015, this earth dam structure stands at a hydraulic height of 13 feet and has a structural height of 11 feet. With a normal storage capacity of 12.7 acre-feet and a maximum storage of 16 acre-feet, this reservoir covers a surface area of 2 acres and serves primarily for irrigation purposes.
Despite being a privately owned facility, Baby Gap Ranch Reservoir is regulated by the Washington Department of Ecology and undergoes regular inspections to ensure its safety and compliance with state regulations. The reservoir has a high hazard potential but is currently assessed to be in satisfactory condition. Emergency action plans are in place, and the last inspection in June 2021 confirmed the reservoir's structural integrity.
Water resource and climate enthusiasts will appreciate the vital role that Baby Gap Ranch Reservoir plays in supporting agricultural irrigation in the region. As part of the Yakima River system, this reservoir contributes to water management and conservation efforts, highlighting the importance of sustainable water resource practices in the face of changing climate conditions. With its modern design and state-regulated operations, Baby Gap Ranch Reservoir stands as a symbol of responsible water management and environmental stewardship in Washington State.
Year Completed |
2015 |
Dam Length |
1150 |
River Or Stream |
Yakima River |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
13 |
Nid Storage |
16 |
Structural Height |
11 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
13 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Yakima River At Mabton
|
28900cfs |
Yakima River At Kiona
|
23800cfs |
Granger Drain At Granger
|
13cfs |
Columbia River Below Priest Rapids Dam
|
124000cfs |
Umatilla River Near Umatilla
|
516cfs |
Yakima River Above Ahtanum Creek At Union Gap
|
14200cfs |
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.
Baby Gap Ranch Reservoir