Montezuma/club Island Wwt Lagoons

Montezuma/club Island Wwt Lagoons is an earth dam located in Mercer County, Ohio, built in 1985. It carries a Significant hazard potential classification and has a fair condition assessment.

About Montezuma/club Island Wwt Lagoons

The primary purpose of Montezuma/club Island Wwt Lagoons 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 Mercer County (local government). It impounds the Offstream - Beaver Creek near Montezuma.

The dam stands 17 feet tall and stretches 6,200 feet across, creates a reservoir covering 37 acres, has a maximum storage capacity of 420 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1985, the structure is 41 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. An emergency action plan is in place for this dam. The most recent inspection on record was 12/04/2024.

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Significant HazardFair ConditionEmergency Action Plan: Yes

Location

StateOhio
CountyMercer
Nearest CityMontezuma
River/StreamOffstream - Beaver Creek
Coordinates40.47500, -84.54833

Physical Characteristics

Dam TypeEarth
NID Height17 ft
Dam Height17 ft
Dam Length6,200 ft
Year Completed1985 (41 years old)

Storage & Hydraulics

NID Storage420 acre-ft
Max Storage420 acre-ft
Normal Storage215 acre-ft
Surface Area37 acres
Drainage Area0 sq mi

Ownership & Safety

PurposeTailings
OwnerMercer County
Owner TypeLocal Government
Hazard ClassificationSignificant
Condition AssessmentFair
Last Inspection12/04/2024
Emergency Action PlanYes

Identifiers

NID IDOH02800
Federal IDOH02800
More InfoState Dam Safety Program

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