Crocker Diversion Reservoir Report

Last Updated: December 5, 2025

Crocker Diversion, located in Snelling, California, along the Merced River, was completed in 1910 with a primary purpose of flood risk reduction.


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Summary

This gravity dam stands at 22 feet high and has a storage capacity of 300 acre-feet. The dam plays a crucial role in irrigation, water supply, and flood risk reduction in the region.

Owned by a public utility, Crocker Diversion is regulated and inspected by the California Department of Water Resources (DWR) for safety compliance. With a low hazard potential and satisfactory condition assessment, the dam ensures the safety of the surrounding communities. The last inspection was conducted in May 2020, with a frequency of once per year, indicating a proactive approach to maintenance and monitoring.

Despite its age, Crocker Diversion continues to serve its purpose effectively, protecting the area from potential flooding events. With its strategic location and design, the dam remains a vital component of the water resource management and climate resilience efforts in the region, contributing to the overall sustainability of the Merced River watershed.

Year Completed

1910

Dam Length

725

Dam Height

22

River Or Stream

Merced River

Primary Dam Type

Gravity

Surface Area

56

Hydraulic Height

17

Drainage Area

1045

Nid Storage

300

Hazard Potential

Low

Nid Height

22
       
Seasonal Comparison

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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.