Moriarity Lake Dam
Moriarity Lake Dam is an earth dam located in Grant County, Indiana, built in 2000. It carries a High hazard potential classification.
About Moriarity Lake Dam
The primary purpose of Moriarity Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by John And Becky Moriarity (private). It impounds the Unnamed Tributary Mississinewa River.
The dam stands 25 feet tall and stretches 4,367 feet across, creates a reservoir covering 34 acres, has a maximum storage capacity of 302 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2000, the structure is 26 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Notably, no emergency action plan is currently on file for this high-hazard dam. The most recent inspection on record was 07/22/2002. That was 23 years ago — unusually long for a high-hazard dam, which typically requires more frequent inspections.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Indiana dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Indiana |
| County | Grant |
| River/Stream | Unnamed Tributary Mississinewa River |
| Coordinates | 40.52578, -85.61444 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 4,367 ft |
| Year Completed | 2000 (26 years old) |
Storage & Hydraulics
| NID Storage | 302 acre-ft |
| Max Storage | 302 acre-ft |
| Normal Storage | 187 acre-ft |
| Surface Area | 34 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | None |
Ownership & Safety
| Purpose | Recreation |
| Owner | JOHN AND BECKY MORIARITY |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Rated |
| Last Inspection | 07/22/2002 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IN03984 |
| Federal ID | IN03984 |
| More Info | State Dam Safety Program |