Riggs Reservoir
Riggs Reservoir is an earth dam located in Graham County, Arizona, built in 1929. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Riggs Reservoir
The primary purpose of Riggs 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 Safford (local government). It impounds the Gila River - Offstream near Thatcher.
The dam stands 54 feet tall and stretches 750 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 52 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1929, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. 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 04/08/2021.
At 54 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Arizona |
| County | Graham |
| Nearest City | Thatcher |
| River/Stream | Gila River - Offstream |
| Coordinates | 32.78389, -109.77667 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 54 ft |
| Dam Height | 31 ft |
| Dam Length | 750 ft |
| Year Completed | 1929 (97 years old) |
Storage & Hydraulics
| NID Storage | 52 acre-ft |
| Max Storage | 52 acre-ft |
| Normal Storage | 39 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 30 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF SAFFORD |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/08/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | AZ00158 |
| Federal ID | AZ00158 |
| More Info | State Dam Safety Program |