Ontario Millpond Dam
Ontario Millpond Dam is an earth dam located in LaGrange County, Indiana, built in 1920. It carries a Significant hazard potential classification and has a poor condition assessment.
About Ontario Millpond Dam
The primary purpose of Ontario Millpond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Indiana Department Of Natural Resources (state). It impounds the Pigeon River.
The dam stands 16 feet tall and stretches 120 feet across, creates a reservoir covering 100 acres, and collects water from a drainage area of 236 square miles. Completed in 1920, the structure is over a century 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 08/01/2019.
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Location
| State | Indiana |
| County | LaGrange |
| River/Stream | Pigeon River |
| Coordinates | 41.70709, -85.37552 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 120 ft |
| Year Completed | 1920 (106 years old) |
Storage & Hydraulics
| Surface Area | 100 acres |
| Drainage Area | 236 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | INDIANA DEPARTMENT OF NATURAL RESOURCES |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 08/01/2019 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IN00347 |
| Federal ID | IN00347 |
| More Info | State Dam Safety Program |