Heron Lake Dam Upper is an earth dam located in Montgomery County, Missouri, built in 1963. It carries a High hazard potential classification.
Dam profile
NID height · 16 ft16 ft tall. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Heron Lake Dam Upper
The primary purpose of Heron Lake Dam Upper is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Clayton Commodity Servic (private). It impounds the Tr-bear Creek near Truxton.
The dam stands 16 feet tall, creates a reservoir covering 11 acres, has a maximum storage capacity of 94 acre-feet, and collects water from a drainage area of 100 square miles. Completed in 1963, 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 | Montgomery |
| Nearest City | Truxton |
| River/Stream | Tr-bear Creek |
| Coordinates | 38.92565, -91.35166 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 94 acre-ft |
| Max Storage | 94 acre-ft |
| Normal Storage | 51 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 100 sq mi |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Clayton Commodity Servic |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO10916 |
| Federal ID | MO10916 |
| More Info | State Dam Safety Program |