Alluvial Drain Detention Reservoir Report
Nearby: Big Dry Creek Redbank
Last Updated: December 5, 2025
Alluvial Drain Detention, located in Clovis, California, is a crucial infrastructure owned by a public utility aimed at reducing flood risks along the Tr Big Dry Creek.
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Summary
Completed in 1994, this earth dam stands at 12 feet high with a hydraulic height of 8.4 feet, providing a storage capacity of 832.7 acre-feet across its 67.5-acre surface area. With a drainage area of 2.97 square miles, this detention structure plays a vital role in flood risk reduction efforts in Fresno County.
Managed and regulated by the California Department of Water Resources (DWR) and Safety of Dams program, Alluvial Drain Detention is subject to regular inspections to ensure its satisfactory condition and high hazard potential are adequately addressed. Despite its high hazard classification, the dam's condition was last assessed as satisfactory in September 2017, with the most recent inspection conducted in February 2021. As a critical component of the state's flood risk reduction strategy, Alluvial Drain Detention plays a significant role in safeguarding the local community from potential inundation events.
With its strategic location and effective design, Alluvial Drain Detention serves as a key flood risk reduction infrastructure in California's water resource management system. As a vital earth dam structure along Tr Big Dry Creek, this facility exemplifies the state's commitment to ensuring public safety and mitigating the impacts of flooding in Fresno County. Through ongoing regulatory oversight and regular inspections, Alluvial Drain Detention remains a resilient and essential asset in the state's efforts to protect communities and infrastructure from the threat of inundation.
Year Completed |
1994 |
Dam Length |
134 |
Dam Height |
12 |
River Or Stream |
Tr Big Dry Creek |
Primary Dam Type |
Earth |
Surface Area |
67.5 |
Hydraulic Height |
8.4 |
Drainage Area |
2.97 |
Nid Storage |
832.7 |
Hazard Potential |
High |
Nid Height |
12 |
Seasonal Comparison
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Nearby Streamflow Levels
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.
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