Halfway Detention Dam
Halfway Detention Dam is a gravity dam located in Graham County, Arizona, built in 1940. It carries a Low hazard potential classification and has a fair condition assessment.
About Halfway Detention Dam
The primary purpose of Halfway 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 18 feet tall and stretches 1,680 feet across, creates a reservoir covering 16 acres, and has a maximum storage capacity of 247 acre-feet. Completed in 1940, the structure is well-established, with more than 75 years of service.
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 07/08/2015. That was over 10 years ago.
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Location
| State | Arizona |
| County | Graham |
| Nearest City | Solomon, Az |
| River/Stream | San Simon River |
| Coordinates | 32.74509, -109.54581 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 18 ft |
| Dam Length | 1,680 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 247 acre-ft |
| Max Storage | 247 acre-ft |
| Surface Area | 16 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 07/08/2015 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | AZ20013 |
| Federal ID | AZ20013 |
| More Info | State Dam Safety Program |