Coleman Dam Reservoir Report
Last Updated: December 15, 2025
Coleman Dam, located in Yakima, Washington, is a privately owned structure regulated by the Washington Department of Ecology.
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Summary
Completed in 1982, this earth-type dam stands at a height of 22 feet and spans a length of 1050 feet. With a storage capacity of 29 acre-feet, the dam serves a primary purpose of "Other" and is designated as having a high hazard potential due to its condition assessment of "Poor."
Despite its high hazard potential, Coleman Dam has undergone inspections every 5 years, with the last assessment conducted in April 2017. The dam's emergency action plan status and risk management measures remain undisclosed, leaving some uncertainty regarding its preparedness for potential hazards. Water resource and climate enthusiasts may be interested in monitoring any updates related to Coleman Dam's condition and regulatory oversight, as its location in a heavily regulated state like Washington raises questions about its safety and resilience in the face of changing environmental conditions.
Year Completed |
1982 |
Dam Length |
1050 |
Dam Height |
22 |
Primary Dam Type |
Earth |
Hydraulic Height |
22 |
Nid Storage |
29 |
Structural Height |
22 |
Hazard Potential |
High |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Granger Drain At Granger
|
13cfs |
Yakima River At Mabton
|
19900cfs |
Yakima River Above Ahtanum Creek At Union Gap
|
11300cfs |
Columbia River Below Priest Rapids Dam
|
115000cfs |
Ahtanum Creek At Union Gap
|
164cfs |
Crab Creek Near Beverly
|
160cfs |
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.
Coleman Dam