Aps Lined Ash Impoundment
Aps Lined Ash Impoundment is an earth dam located in San Juan County, New Mexico, built in 2003. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Aps Lined Ash Impoundment
The primary purpose of Aps Lined Ash Impoundment is tailings. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted. These structures require ongoing monitoring because tailings can contain heavy metals and other contaminants. The dam is owned by Arizona Public Service Company (public utility). It impounds the Chaco Wash - Tr near Shiprock.
The dam stands 40 feet tall and stretches 4,200 feet across, creates a reservoir covering 56 acres, has a maximum storage capacity of 830 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2003, the structure is relatively new.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 11/20/2019.
At 40 feet, this dam is taller than 87% of dams nationwide.
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Location
| State | New Mexico |
| County | San Juan |
| Nearest City | Shiprock |
| River/Stream | Chaco Wash - Tr |
| Coordinates | 36.68490, -108.50660 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 4,200 ft |
| Year Completed | 2003 (23 years old) |
Storage & Hydraulics
| NID Storage | 830 acre-ft |
| Max Storage | 830 acre-ft |
| Normal Storage | 98 acre-ft |
| Surface Area | 56 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | None |
Ownership & Safety
| Purpose | Tailings |
| Owner | ARIZONA PUBLIC SERVICE COMPANY |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/20/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NM00633 |
| Federal ID | NM00633 |
| More Info | State Dam Safety Program |