Sleepy Hollow No. 2 Reservoir Report

Last Updated: December 5, 2025

Sleepy Hollow No.


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Summary

2 is a privately owned dam located in Sonoma, California, near the city of Lekeville. Built in 1949, this earthen dam serves primarily for water supply purposes, including irrigation and water storage. With a height of 39 feet and a hydraulic height of 33.3 feet, it impounds water from the Tr Petaluma Creek, with a storage capacity of 104 acre-feet and a surface area of 5 acres.

Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, Sleepy Hollow No. 2 is subject to state regulations, permitting, inspections, and enforcement to ensure its safe operation. The dam has a significant hazard potential but has been assessed as satisfactory in condition as of September 2017. The last inspection was conducted in August 2020, with a frequency of once per year to monitor its structural integrity and safety.

Although there are no associated structures with Sleepy Hollow No. 2, its critical role in water supply for the region underscores the importance of regular maintenance and monitoring. As climate change continues to impact water resources and infrastructure, ensuring the safety and reliability of dams like Sleepy Hollow No. 2 becomes increasingly crucial for sustainable water management in California.

Year Completed

1949

Dam Length

600

Dam Height

39

River Or Stream

Tr Petaluma Cr

Primary Dam Type

Earth

Surface Area

5

Hydraulic Height

33.3

Drainage Area

0.78

Nid Storage

104

Hazard Potential

Significant

Nid Height

39
       
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.