Ansonia Sewage Lagoon I

About Ansonia Sewage Lagoon I

The primary purpose of Ansonia Sewage Lagoon I 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 Village Of Ansonia (local government). It impounds the Offstream near Ansonia.

The dam stands 12 feet tall and stretches 3,600 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 42 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1970, the structure is well into its service life at over 50 years old.

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 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 11/07/2024.

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