Byron Ponds Dam Reservoir Report
Last Updated: December 13, 2025
Byron Ponds Dam, located in Prosser, Washington, is a state-owned structure on the Tr-Yakima River with a primary purpose of recreation.
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Summary
This gravity dam, completed in 1950, stands at a hydraulic height of 10 feet and a structural height of 9 feet, with a length of 30 feet. It has a storage capacity of 200 acre-feet, with a normal storage level of 100 acre-feet and a surface area of 50 acres.
The dam is classified as low hazard potential and has not been rated for its condition assessment. It is regulated by the Washington Department of Ecology and undergoes state inspection and enforcement. While the last inspection date was in 1998, the dam has not been modified in recent years. Although the dam does not have spillways or outlet gates, it serves as a recreational site for locals and visitors alike.
Located in Congressional District 04, Washington, Byron Ponds Dam offers a peaceful retreat for water resource and climate enthusiasts. With its scenic surroundings and historical significance, this dam provides a unique opportunity to appreciate the intersection of human engineering and natural beauty in the Yakima Valley.
Year Completed |
1950 |
Dam Length |
30 |
River Or Stream |
Tr-Yakima River |
Primary Dam Type |
Gravity |
Surface Area |
50 |
Hydraulic Height |
10 |
Drainage Area |
1.3 |
Nid Storage |
200 |
Structural Height |
9 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Yakima River At Mabton
|
26200cfs |
Granger Drain At Granger
|
13cfs |
Yakima River At Kiona
|
20700cfs |
Columbia River Below Priest Rapids Dam
|
103000cfs |
Umatilla River Near Umatilla
|
1540cfs |
Yakima River Above Ahtanum Creek At Union Gap
|
29600cfs |
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.
Byron Ponds Dam