Spooner Reservoir Report
Nearby: Holbrook Nelson Corral Dam (Blm)
Last Updated: December 26, 2025
Spooner, located in Lassen, California, is a privately owned dam on Tr Ash Creek with a primary purpose of water supply for irrigation and other needs.
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Summary
Built in 1906, this earth dam stands at a height of 17 feet and has a storage capacity of 3,123 acre-feet. Its low hazard potential and satisfactory condition make it an important asset for water management in the region.
Managed by the California Department of Water Resources (DWR) and subject to state regulation, inspection, and enforcement, Spooner plays a crucial role in providing water to the surrounding area. The dam's location in Ash Valley, along with its efficient design by the Natural Resources Conservation Service, ensures the reliable supply of water for agricultural and domestic use. With a drainage area of 6.6 square miles and a surface area of 635 acres, Spooner contributes significantly to the water resources of the region.
Despite its age, Spooner remains a vital infrastructure for water management in California, operating with a focus on water supply reliability and safety. Regular inspections and maintenance ensure that the dam continues to serve its purpose effectively, reflecting a commitment to sustainable water resource management in the face of changing climatic conditions. For water resource and climate enthusiasts, Spooner represents a blend of historical significance and contemporary relevance in the realm of water infrastructure.
Year Completed |
1906 |
Dam Length |
450 |
Dam Height |
17 |
River Or Stream |
Tr Ash Creek |
Primary Dam Type |
Earth |
Surface Area |
635 |
Hydraulic Height |
12.5 |
Drainage Area |
6.6 |
Nid Storage |
3123 |
Hazard Potential |
Low |
Nid Height |
17 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Sf Pit R Nr Likely Ca
|
32cfs |
Pit R Nr Canby Ca
|
724cfs |
Pit R Bl Pit No 1 Ph Nr Fall River Mills Ca
|
3620cfs |
Hat C Nr Hat Creek Ca
|
304cfs |
Burney C A Burney Falls Nr Burney Ca
|
168cfs |
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.
Spooner