Casitas Reservoir Report

Last Updated: December 5, 2025

Casitas in California refer to small, artificially created reservoirs or lakes primarily used for hydroelectric power generation, irrigation, and recreation.


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Summary

The history of these reservoirs dates back to the early 1900s when the demand for water in the region increased due to the growth of agriculture and urbanization. Today, Casitas are managed and operated by various agencies such as Ventura County Watershed Protection District and Casitas Municipal Water District. These agencies are responsible for ensuring the availability of water supply to the residents of the region. Furthermore, Casitas receive water from both surface flow and snowpack providers such as the Santa Ana River and the Ventura River. The reservoirs are also used for recreational purposes such as boating, swimming, and fishing, while the surrounding agricultural lands rely on the reservoirs for irrigation.

Reservoir Details

Storage 24hr Change -0.05%
Percent of Normal 193%
Minimum 70,878.0 acre-ft
2022-11-30
Maximum 237,968.0 acre-ft
2024-04-22
Average 122,705 acre-ft
Dam_Height 334
Hydraulic_Height 279
Drainage_Area 39
Years_Modified 2001 - Foundation, 2001 - Seismic, 2001 - Structural
Year_Completed 1959
Nid_Storage 283727
Hazard_Potential High
Structural_Height 334
Primary_Dam_Type Earth
River_Or_Stream COYOTE CREEK
Foundations Rock
Surface_Area 2720
Dam_Length 2000
Nid_Height 334
       
Seasonal Comparison
Storage Levels
Pool Elevation Levels
Top Conserv Storage Levels
Inflow Levels

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.