One Eleven Detention Dam
One Eleven Detention Dam is a gravity dam located in Graham County, Arizona, built in 1968. It carries a Low hazard potential classification and has a fair condition assessment.
About One Eleven Detention Dam
The primary purpose of One Eleven Detention Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Doi Blm (federal). It impounds the San Simon River near Solomon, Az.
The dam stands 37 feet tall and stretches 850 feet across, creates a reservoir covering 42 acres, has a maximum storage capacity of 657 acre-feet, and collects water from a drainage area of 14 square miles. Completed in 1968, the structure is well into its service life at over 50 years 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 07/07/2009. That was over 16 years ago.
At 37 feet, this dam is taller than 84% of dams nationwide.
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Location
| State | Arizona |
| County | Graham |
| Nearest City | Solomon, Az |
| River/Stream | San Simon River |
| Coordinates | 32.71495, -109.45986 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 37 ft |
| Dam Length | 850 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 657 acre-ft |
| Max Storage | 657 acre-ft |
| Normal Storage | 448 acre-ft |
| Surface Area | 42 acres |
| Drainage Area | 14 sq mi |
| Max Discharge | 1,488 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 07/07/2009 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | AZ20019 |
| Federal ID | AZ20019 |
| More Info | State Dam Safety Program |