Thunderbird Park Reservoir
Thunderbird Park Reservoir is an earth dam located in Maricopa County, Arizona, built in 1985. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Thunderbird Park Reservoir
The primary purpose of Thunderbird Park Reservoir 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 Glendale, Cholla Water Treatment Plant (local government). It impounds the Unnamed Wash - Os near Glendale.
The dam stands 44 feet tall and stretches 600 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 39 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1985, the structure is 41 years 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. An emergency action plan is in place for this dam. The most recent inspection on record was 04/26/2024.
At 44 feet, this dam is taller than 90% 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 Arizona 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 | Arizona |
| County | Maricopa |
| Nearest City | Glendale |
| River/Stream | Unnamed Wash - Os |
| Coordinates | 33.69083, -112.19833 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 44 ft |
| Dam Height | 44 ft |
| Dam Length | 600 ft |
| Year Completed | 1985 (41 years old) |
Storage & Hydraulics
| NID Storage | 39 acre-ft |
| Max Storage | 39 acre-ft |
| Normal Storage | 37 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 75 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF GLENDALE, CHOLLA WATER TREATMENT PLANT |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/26/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | AZ00204 |
| Federal ID | AZ00204 |
| More Info | State Dam Safety Program |