Atascadero Park
Atascadero Park is an earth dam located in San Luis Obispo County, California, built in 1918. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Atascadero Park
The primary purpose of Atascadero Park is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Atascadero (local government). It impounds the Tr Atascadero Cr near Atascadero.
The dam stands 18 feet tall and stretches 500 feet across, creates a reservoir covering 30 acres, has a maximum storage capacity of 250 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1918, the structure is over a century old.
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. Notably, no emergency action plan is currently on file for this high-hazard dam. The most recent inspection on record was 01/27/2025.
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 | San Luis Obispo |
| Nearest City | Atascadero |
| River/Stream | Tr Atascadero Cr |
| Coordinates | 35.46810, -120.66720 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 500 ft |
| Year Completed | 1918 (108 years old) |
Storage & Hydraulics
| NID Storage | 250 acre-ft |
| Max Storage | 250 acre-ft |
| Surface Area | 30 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Atascadero |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 01/27/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00723 |
| Federal ID | CA00723 |
| More Info | State Dam Safety Program |