Joe Machs Lake Dam
Joe Machs Lake Dam is an earth dam located in St. Louis County, Missouri, built in 1996. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Joe Machs Lake Dam
Joe Machs Lake Dam is a dam in St. Louis, Missouri. The dam is private-owned.
The dam stands 56 feet tall and stretches 460 feet across, creates a reservoir covering 22 acres, has a maximum storage capacity of 1,290 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1996, the structure is 30 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 04/05/2022.
At 56 feet, this dam is taller than 94% 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 | St. Louis |
| Coordinates | 38.56429, -90.71374 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 56 ft |
| Dam Height | 56 ft |
| Dam Length | 460 ft |
| Year Completed | 1996 (30 years old) |
Storage & Hydraulics
| NID Storage | 1,290 acre-ft |
| Max Storage | 1,290 acre-ft |
| Normal Storage | 377 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 955 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/05/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO32028 |
| Federal ID | MO32028 |
| More Info | State Dam Safety Program |