Hermora Lake Dam
Hermora Lake Dam is an earth dam located in Pettis County, Missouri, built in 1964. It carries a High hazard potential classification.
About Hermora Lake Dam
The primary purpose of Hermora Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Dick G Mansees (private). It impounds the Tr-flat Creek near Otterville.
The dam stands 26 feet tall, creates a reservoir covering 15 acres, has a maximum storage capacity of 209 acre-feet, and collects water from a drainage area of 385 square miles. Completed in 1964, 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.
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 | Pettis |
| Nearest City | Otterville |
| River/Stream | Tr-flat Creek |
| Coordinates | 38.68207, -93.16732 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 209 acre-ft |
| Max Storage | 209 acre-ft |
| Normal Storage | 120 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 385 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | DICK G MANSEES |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO20192 |
| Federal ID | MO20192 |
| More Info | State Dam Safety Program |