Granite Basin
Granite Basin is a concrete dam located in Yavapai County, Arizona, built in 1939. It carries a High hazard potential classification.
About Granite Basin
The primary purpose of Granite Basin is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Usda Fs (federal). It impounds the Mint Wash.
The dam stands 27 feet tall and stretches 438 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 90 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1939, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 08/19/2019.
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 | Yavapai |
| River/Stream | Mint Wash |
| Coordinates | 34.61750, -112.54890 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 438 ft |
| Year Completed | 1939 (87 years old) |
Storage & Hydraulics
| NID Storage | 90 acre-ft |
| Max Storage | 90 acre-ft |
| Normal Storage | 90 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 5,300 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | USDA FS |
| Owner Type | Federal |
| Hazard Classification | High |
| Condition Assessment | Not Rated |
| Last Inspection | 08/19/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | AZ10143 |
| Federal ID | AZ10143 |
| More Info | State Dam Safety Program |