West Halfway Detention Dam
West Halfway Detention Dam is a gravity dam located in Graham County, Arizona. It carries a Low hazard potential classification and has a fair condition assessment.
About West Halfway Detention Dam
The primary purpose of West Halfway Detention Dam is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by Doi Blm (federal). It impounds the San Simon River near Solomon, Az.
The dam stands 21 feet tall and stretches 940 feet across, creates a reservoir covering 84 acres, has a maximum storage capacity of 405 acre-feet, and collects water from a drainage area of 3 square miles.
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 | 32.76162, -109.57876 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 21 ft |
| Dam Length | 940 ft |
Storage & Hydraulics
| NID Storage | 405 acre-ft |
| Max Storage | 405 acre-ft |
| Normal Storage | 23 acre-ft |
| Surface Area | 84 acres |
| Drainage Area | 3 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Debris Control |
| 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 | AZ20032 |
| Federal ID | AZ20032 |
| More Info | State Dam Safety Program |