Quarry Pits Reservoir Report

Last Updated: December 5, 2025

Quarry Pits in Fremont, California, is a locally-owned dam structure situated along the Old Alameda Creek.


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Summary

Built in 1997, this Earth dam stands at 26 feet in height and spans a length of 9150 feet, with a storage capacity of 3360 acre-feet. While primarily serving as a tailings facility, Quarry Pits also plays a role in water supply and recreational activities in the area. The dam is state-regulated by the Department of Water Resources (DWR) and undergoes regular inspections to ensure its safety and functionality.

Despite its satisfactory condition assessment as of September 2017, Quarry Pits poses a high hazard potential due to its location and size. The dam's emergency action plan (EAP) status and risk management measures remain unclear, indicating a potential area for improvement in terms of emergency preparedness. With a notable presence in the Sacramento District, Quarry Pits is a significant water resource structure that requires ongoing monitoring and maintenance to mitigate risks and ensure the safety of surrounding communities.

As a key component of the local government's infrastructure, Quarry Pits serves multiple purposes beyond its initial construction for tailings storage. Its location along the Old Alameda Creek highlights its importance in managing water resources in the region. With a history dating back to 1997, this Earth dam continues to play a vital role in water supply, recreation, and environmental preservation efforts in Alameda County.

Year Completed

1997

Dam Length

9150

Dam Height

26

River Or Stream

Old Alameda Creek

Primary Dam Type

Earth

Surface Area

330

Hydraulic Height

9

Drainage Area

1.5

Nid Storage

3360

Hazard Potential

High

Nid Height

26
       
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.