Lost Creek Watershed Site A-1
Lost Creek Watershed Site A-1 is an earth dam located in Newton County, Missouri, built in 1992. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Lost Creek Watershed Site A-1
The primary purpose of Lost Creek Watershed Site A-1 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Lost Creek Watershed Sbd (local government). It impounds the Tributary, Little Lost Creek near Seneca.
The dam stands 49 feet tall and stretches 1,450 feet across, creates a reservoir covering 55 acres, has a maximum storage capacity of 367 acre-feet, and collects water from a drainage area of 9 square miles. Completed in 1992, the structure is 34 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 01/10/2023.
At 49 feet, this dam is taller than 92% of dams nationwide.
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 Missouri 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 | Missouri |
| County | Newton |
| Nearest City | Seneca |
| River/Stream | Tributary, Little Lost Creek |
| Coordinates | 36.91288, -94.50232 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 49 ft |
| Dam Height | 49 ft |
| Dam Length | 1,450 ft |
| Year Completed | 1992 (34 years old) |
Storage & Hydraulics
| NID Storage | 367 acre-ft |
| Max Storage | 367 acre-ft |
| Normal Storage | 367 acre-ft |
| Surface Area | 55 acres |
| Drainage Area | 9 sq mi |
| Max Discharge | 36,894 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | LOST CREEK WATERSHED SBD |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 01/10/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO20781 |
| Federal ID | MO20781 |
| More Info | State Dam Safety Program |