Spring Reservoir Report

Last Updated: December 5, 2025

Spring is a privately owned dam located in Yosemite Lakes, California, along the Longhollow Creek.


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Summary

Built in 1971, this Earth-type dam stands at a height of 41 feet and has a storage capacity of 152 acre-feet. Its primary purpose is water supply, supporting both recreational activities and water needs in the area. Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, the dam is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and functionality.

With a significant hazard potential but a satisfactory condition assessment as of September 2017, Spring Dam plays a crucial role in water resource management in Madera County, California. Its location within the Sacramento District adds to its importance in providing water supply and supporting recreational activities in the region. The dam has a spillway width and other structural details that contribute to its operational efficiency and safety measures. Regular inspections and emergency preparedness efforts are in place to mitigate risks associated with the dam's operation.

As a key infrastructure for water supply, Spring Dam is a vital component in the overall water management system in the area. With its strategic location and operational capacity, the dam ensures a reliable water source for the surrounding community while also offering recreational opportunities. The collaboration between state agencies and private ownership highlights the importance of regulatory oversight and maintenance to guarantee the safety and sustainability of water resources in the region.

Year Completed

1971

Dam Length

335

Dam Height

41

River Or Stream

Longhollow Creek

Primary Dam Type

Earth

Surface Area

22

Hydraulic Height

33.4

Drainage Area

2.87

Nid Storage

152

Hazard Potential

Significant

Nid Height

41
       
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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.