Hill Annex No. 1 (north)

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 96% of all dams in the United States.

Search for dams near your address to see all dams in your area with hazard classifications and safety data.