St. John Commons Dam
St. John Commons Dam is an earth dam located in Morgan County, Indiana, built in 2002. It carries a High hazard potential classification and has a satisfactory condition assessment.
About St. John Commons Dam
St. John Commons Dam is a dam in Morgan, Indiana. The dam is owned by St. John Commons Home Owners Association (private). It impounds the Long Run.
The dam stands 29 feet tall and stretches 300 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2002, the structure is relatively new.
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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 08/11/2017. That was 8 years ago, which is on the longer end for a high-hazard structure.
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 | Morgan |
| River/Stream | Long Run |
| Coordinates | 39.38875, -86.25543 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 300 ft |
| Year Completed | 2002 (24 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 108 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 4,368 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | St. John Commons Home Owners Association |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/11/2017 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IN03998 |
| Federal ID | IN03998 |
| More Info | State Dam Safety Program |