Vasona Percolating
Vasona Percolating is an earth dam located in Santa Clara County, California, built in 1935. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Vasona Percolating
Vasona Percolating is a dam in Santa Clara, California. The dam is owned by Santa Clara Valley Water District (public utility). It impounds the Los Gatos Crk near Los Gatos.
The dam stands 34 feet tall and stretches 1,000 feet across, creates a reservoir covering 58 acres, has a maximum storage capacity of 410 acre-feet, and collects water from a drainage area of 44 square miles. Completed in 1935, the structure is well-established, with more than 75 years of service.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 11/18/2025.
At 34 feet, this dam is taller than 80% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The California dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | California |
| County | Santa Clara |
| Nearest City | Los Gatos |
| River/Stream | Los Gatos Crk |
| Coordinates | 37.24620, -121.96370 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 34 ft |
| Dam Height | 34 ft |
| Dam Length | 1,000 ft |
| Year Completed | 1935 (91 years old) |
Storage & Hydraulics
| NID Storage | 410 acre-ft |
| Max Storage | 410 acre-ft |
| Surface Area | 58 acres |
| Drainage Area | 44 sq mi |
Ownership & Safety
| Purpose | Other |
| Owner | Santa Clara Valley Water District |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/18/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00291 |
| Federal ID | CA00291 |
| More Info | State Dam Safety Program |