Lonergan Dam
Lonergan Dam is an earth dam located in Douglas County, Nebraska, built in 1968. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Lonergan Dam
The primary purpose of Lonergan Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Jsp Lakeside Llc (private). It impounds the Tr-little Papio Creek near Omaha.
The dam stands 75 feet tall and stretches 1,320 feet across, creates a reservoir covering 120 acres, has a maximum storage capacity of 2,623 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1968, the structure is well into its service life at over 50 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. 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 06/25/2024.
At 75 feet, this dam is taller than 97% of all dams in the United States.
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 Nebraska 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 | Nebraska |
| County | Douglas |
| Nearest City | Omaha |
| River/Stream | Tr-little Papio Creek |
| Coordinates | 41.37068, -96.04017 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 75 ft |
| Dam Height | 72 ft |
| Dam Length | 1,320 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 2,623 acre-ft |
| Max Storage | 2,623 acre-ft |
| Normal Storage | 2,019 acre-ft |
| Surface Area | 120 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 486 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | JSP Lakeside LLC |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/25/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NE00030 |
| Federal ID | NE00030 |
| More Info | State Dam Safety Program |