Round Mountain Detention Dam 2
Round Mountain Detention Dam 2 is a gravity dam located in Greenlee County, Arizona, built in 1954. It carries a Low hazard potential classification and has a fair condition assessment.
About Round Mountain Detention Dam 2
The primary purpose of Round Mountain Detention Dam 2 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 Round Mountain Draw Wash near Lazy B Ranch Headquarters.
The dam stands 30 feet tall and stretches 1,200 feet across, creates a reservoir covering 75 acres, has a maximum storage capacity of 920 acre-feet, and collects water from a drainage area of 32 square miles. Completed in 1954, 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 05/18/2005. That was over 20 years ago.
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Location
| State | Arizona |
| County | Greenlee |
| Nearest City | Lazy B Ranch Headquarters |
| River/Stream | Round Mountain Draw Wash |
| Coordinates | 32.54387, -109.08982 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 30 ft |
| Dam Length | 1,200 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 920 acre-ft |
| Max Storage | 920 acre-ft |
| Normal Storage | 650 acre-ft |
| Surface Area | 75 acres |
| Drainage Area | 32 sq mi |
| Max Discharge | 5,250 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/18/2005 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | AZ20023 |
| Federal ID | AZ20023 |
| More Info | State Dam Safety Program |