Unimin Tailings Pond O Dam
Unimin Tailings Pond O Dam is an earth dam located in LaSalle County, Illinois, built in 2010. It carries a Low hazard potential classification.
About Unimin Tailings Pond O Dam
The primary purpose of Unimin Tailings Pond O Dam 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 Covia Holdings Corporation (private). It impounds the None near North Utica.
The dam stands 56 feet tall and stretches 924 feet across, creates a reservoir covering 33 acres, has a maximum storage capacity of 650 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2010, the structure is relatively new.
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. The most recent inspection on record was 08/17/2021.
At 56 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Illinois |
| County | LaSalle |
| Nearest City | North Utica |
| River/Stream | None |
| Coordinates | 41.34829, -88.99415 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 56 ft |
| Dam Height | 56 ft |
| Dam Length | 924 ft |
| Year Completed | 2010 (16 years old) |
Storage & Hydraulics
| NID Storage | 650 acre-ft |
| Max Storage | 650 acre-ft |
| Normal Storage | 530 acre-ft |
| Surface Area | 33 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Tailings |
| Owner | COVIA HOLDINGS CORPORATION |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 08/17/2021 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50605 |
| Federal ID | IL50605 |
| More Info | State Dam Safety Program |