Western Hibtac is an earth dam located in St. Louis County, Minnesota, built in 1978. It carries a Undetermined hazard potential classification.
Dam profile
NID height · 100 ft100 ft tall and 20,900 ft long, taller than 98% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Western Hibtac
The primary purpose of Western Hibtac 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 Hibbing Taconite Company (private). It impounds the Rock Lake Creek near Grand Rapids.
The dam stands 100 feet tall and stretches 20,900 feet across, creates a reservoir covering 2,500 acres, has a maximum storage capacity of 30,000 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1978, the structure is 48 years old.
At 100 feet, this dam is taller than 98% of all dams in the United States.
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Location
| State | Minnesota |
| County | St. Louis |
| Nearest City | Grand Rapids |
| River/Stream | Rock Lake Creek |
| Coordinates | 47.47957, -93.02231 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 100 ft |
| Dam Height | 100 ft |
| Dam Length | 20,900 ft |
| Year Completed | 1978 (48 years old) |
Storage & Hydraulics
| NID Storage | 30,000 acre-ft |
| Max Storage | 30,000 acre-ft |
| Normal Storage | 10,000 acre-ft |
| Surface Area | 2,500 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 1,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Tailings |
| Owner | Hibbing Taconite Company |
| Owner Type | Private |
| Hazard Classification | Undetermined |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00928 |
| Federal ID | MN00928 |
| More Info | State Dam Safety Program |