Lost Cr Pilot Watershed Dam F-4
Lost Cr Pilot Watershed Dam F-4 is an earth dam located in Lincoln County, Missouri, built in 1958. It carries a High hazard potential classification.
About Lost Cr Pilot Watershed Dam F-4
The primary purpose of Lost Cr Pilot Watershed Dam F-4 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 Robert Pirtle (local government). It impounds the Tr-lost Creek near Elsberry.
The dam stands 31 feet tall and stretches 610 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 255 acre-feet, and collects water from a drainage area of 51 square miles. Completed in 1958, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 06/14/1979. That was 46 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 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 | Lincoln |
| Nearest City | Elsberry |
| River/Stream | Tr-lost Creek |
| Coordinates | 39.13896, -90.80784 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 29 ft |
| Dam Length | 610 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 255 acre-ft |
| Max Storage | 255 acre-ft |
| Normal Storage | 55 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 51 sq mi |
| Max Discharge | 5,900 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | ROBERT PIRTLE |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Not Rated |
| Last Inspection | 06/14/1979 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO50335 |
| Federal ID | MO50335 |
| More Info | State Dam Safety Program |