Crosby Tank Detention Dam
Crosby Tank Detention Dam is a gravity dam located in Mohave County, Arizona, built in 1959. It carries a Low hazard potential classification and has a poor condition assessment.
About Crosby Tank Detention Dam
The primary purpose of Crosby Tank 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 Langs Run near Saint George, Utah.
The dam stands 31 feet tall and stretches 620 feet across, creates a reservoir covering 139 acres, has a maximum storage capacity of 1,691 acre-feet, and collects water from a drainage area of 39 square miles. Completed in 1959, 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 07/25/2008. That was over 17 years ago.
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Location
| State | Arizona |
| County | Mohave |
| Nearest City | Saint George, Utah |
| River/Stream | Langs Run |
| Coordinates | 36.45154, -113.23456 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 31 ft |
| Dam Length | 620 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 1,691 acre-ft |
| Max Storage | 1,691 acre-ft |
| Normal Storage | 1,099 acre-ft |
| Surface Area | 139 acres |
| Drainage Area | 39 sq mi |
| Max Discharge | 2,200 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 07/25/2008 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | AZ20010 |
| Federal ID | AZ20010 |
| More Info | State Dam Safety Program |