Granite Reef Diversion Dam is a concrete dam located in Maricopa County, Arizona, built in 1908. It carries a Low hazard potential classification.
Dam profile
NID height · 29 ft29 ft tall and 1,128 ft long, taller than 65% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Granite Reef Diversion Dam
The primary purpose of Granite Reef Diversion Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Bureau of Reclamation (federal). It impounds the Salt River near Mesa.
The dam stands 29 feet tall and stretches 1,128 feet across, has a maximum storage capacity of 700 acre-feet, and collects water from a drainage area of 13,000 square miles. Completed in 1908, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
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Location
| State | Arizona |
| County | Maricopa |
| Nearest City | Mesa |
| River/Stream | Salt River |
| Coordinates | 33.51570, -111.69160 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 1,128 ft |
| Year Completed | 1908 (118 years old) |
Storage & Hydraulics
| NID Storage | 700 acre-ft |
| Max Storage | 700 acre-ft |
| Normal Storage | 250 acre-ft |
| Drainage Area | 13,000 sq mi |
| Max Discharge | 165,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Bureau of Reclamation |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | AZ10316 |
| Federal ID | AZ10316 |
| More Info | State Dam Safety Program |