Montague No. 2 Reservoir Report

Last Updated: December 5, 2025

Montague No.


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Summary

2, located in Montague, California, is a vital water resource infrastructure owned by the local government. Completed in 1978, this earth dam stands at a height of 41 feet and serves multiple purposes including flood risk reduction, irrigation, and water supply. With a storage capacity of 160 acre-feet and a surface area of 14 acres, Montague No. 2 plays a crucial role in managing the water resources in the area.

Managed by the Department of Water Resources (DWR) for the Safety of Dams, this dam is regulated, permitted, and inspected by the state of California. It is situated on the Tr Oregon Slough and falls under the jurisdiction of the state. Despite having a low hazard potential, Montague No. 2 is in satisfactory condition as per the last assessment in September 2017. The dam has not undergone any major modifications over the years and is crucial for maintaining water supply in the region.

With its strategic location and efficient design, Montague No. 2 serves as a reliable water supply source for the community. Its satisfactory condition, low hazard potential, and regular inspections ensure that it continues to support irrigation, flood risk reduction, and water supply needs effectively. As climate change impacts water resources, structures like Montague No. 2 play a crucial role in managing and conserving this precious resource for future generations.

Year Completed

1978

Dam Length

1250

Dam Height

41

River Or Stream

Tr Oregon Slough

Primary Dam Type

Earth

Surface Area

14

Hydraulic Height

37

Drainage Area

0.16

Nid Storage

160

Hazard Potential

Low

Nid Height

41
       
Seasonal Comparison

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.