State Line Detention Dam
State Line Detention Dam is a gravity dam located in Greenlee County, Arizona, built in 1952. It carries a Low hazard potential classification and has a poor condition assessment.
About State Line Detention Dam
The primary purpose of State Line 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 Olney Well Draw near Franklin, Az.
The dam stands 27 feet tall and stretches 1,028 feet across, creates a reservoir covering 29 acres, has a maximum storage capacity of 382 acre-feet, and collects water from a drainage area of 16 square miles. Completed in 1952, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 08/15/2013. That was over 12 years ago.
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Location
| State | Arizona |
| County | Greenlee |
| Nearest City | Franklin, Az |
| River/Stream | Olney Well Draw |
| Coordinates | 32.52985, -109.05032 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 27 ft |
| Dam Length | 1,028 ft |
| Year Completed | 1952 (74 years old) |
Storage & Hydraulics
| NID Storage | 382 acre-ft |
| Max Storage | 382 acre-ft |
| Normal Storage | 207 acre-ft |
| Surface Area | 29 acres |
| Drainage Area | 16 sq mi |
| Max Discharge | 4,103 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Debris Control |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/15/2013 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | AZ20036 |
| Federal ID | AZ20036 |
| More Info | State Dam Safety Program |