Olney Draw Detention Dam
Olney Draw Detention Dam is a gravity dam located in Greenlee County, Arizona, built in 1953. It carries a Low hazard potential classification and has a fair condition assessment.
About Olney Draw Detention Dam
The primary purpose of Olney Draw 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 Railroad Wash near Duncan, Az.
The dam stands 25 feet tall and stretches 1,475 feet across, creates a reservoir covering 25 acres, has a maximum storage capacity of 320 acre-feet, and collects water from a drainage area of 8 square miles. Completed in 1953, 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 07/21/2015. That was over 10 years ago.
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Location
| State | Arizona |
| County | Greenlee |
| Nearest City | Duncan, Az |
| River/Stream | Railroad Wash |
| Coordinates | 32.52379, -109.06762 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 25 ft |
| Dam Length | 1,475 ft |
| Year Completed | 1953 (73 years old) |
Storage & Hydraulics
| NID Storage | 320 acre-ft |
| Max Storage | 320 acre-ft |
| Normal Storage | 180 acre-ft |
| Surface Area | 25 acres |
| Drainage Area | 8 sq mi |
| Max Discharge | 2,810 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 07/21/2015 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | AZ20018 |
| Federal ID | AZ20018 |
| More Info | State Dam Safety Program |