Hill Annex No. 1 (north) is an earth dam located in Itasca County, Minnesota, built in 1954. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 63 ft63 ft tall and 10,700 ft long, taller than 95% 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 Hill Annex No. 1 (north)
The primary purpose of Hill Annex No. 1 (north) 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 Glacial Park Iron Ore Properties (private). It impounds the Snowball Creek-os near Local Residents.
The dam stands 63 feet tall and stretches 10,700 feet across, has a maximum storage capacity of 3,346 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1954, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 10/04/2023.
At 63 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Minnesota |
| County | Itasca |
| Nearest City | Local Residents |
| River/Stream | Snowball Creek-os |
| Coordinates | 47.31114, -93.23436 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 63 ft |
| Dam Height | 63 ft |
| Dam Length | 10,700 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 3,346 acre-ft |
| Max Storage | 3,346 acre-ft |
| Normal Storage | 2,146 acre-ft |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Tailings |
| Owner | Glacial Park Iron Ore Properties |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/04/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00785 |
| Federal ID | MN00785 |
| More Info | State Dam Safety Program |