Thirtieth Street Dam
Thirtieth Street Dam is an earth dam located in San Juan County, New Mexico, built in 1979. It carries a High hazard potential classification and has a poor condition assessment.
About Thirtieth Street Dam
The primary purpose of Thirtieth Street 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 City Of Farmington (local government). It impounds the College Arroyo near Farmington.
The dam stands 22 feet tall and stretches 550 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 135 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1979, the structure is 47 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. Notably, no emergency action plan is currently on file for this high-hazard dam. The most recent inspection on record was 12/03/2019.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The New Mexico dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | New Mexico |
| County | San Juan |
| Nearest City | Farmington |
| River/Stream | College Arroyo |
| Coordinates | 36.75600, -108.17300 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 550 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 135 acre-ft |
| Max Storage | 135 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 3,107 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | CITY OF FARMINGTON |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 12/03/2019 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NM00423 |
| Federal ID | NM00423 |
| More Info | State Dam Safety Program |