Seeger Reservoir Report

Last Updated: December 5, 2025

Seeger, also known as Nicasio Reservoir, is a vital water resource located in Marin, California.


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Summary

Owned by a public utility, this dam plays a crucial role in flood risk reduction and water supply management. Built in 1961, Seeger stands at a height of 115 feet and has a storage capacity of 22,400 acre-feet, serving a drainage area of 35.9 square miles along the Nicasio Creek.

Managed by the California Department of Water Resources and regulated by the Safety of Dams program, Seeger has a high hazard potential but is currently in satisfactory condition as per the most recent assessment in September 2017. The dam is regularly inspected, with the last evaluation conducted in January 2021, ensuring its structural integrity and safety for surrounding communities. Located in Pt Reyes Station, Seeger is a critical infrastructure that requires ongoing monitoring and maintenance to mitigate any potential risks associated with its operation.

With its strategic location and crucial role in water resource management, Seeger serves as a key asset in California's infrastructure network. As a significant flood risk reduction structure along the Nicasio Creek, Seeger plays a vital role in safeguarding the local community from potential disasters. Ensuring the continued safety and functionality of Seeger is essential for sustainable water resource management and climate resilience in the region.

Year Completed

1961

Dam Length

400

Dam Height

115

River Or Stream

Nicasio Creek

Primary Dam Type

Earth

Surface Area

845

Hydraulic Height

100

Drainage Area

35.9

Nid Storage

22400

Hazard Potential

High

Nid Height

115
       
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.