Lake Lasalle Dam is an earth dam located in St. Louis County, Missouri, built in 1955. It carries a High hazard potential classification.
Dam profile
NID height · 20 ft20 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 Lake Lasalle Dam
The primary purpose of Lake Lasalle Dam 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 Lasalle Institute (private). It impounds the Tr to Carr Creek near Glencoe.
The dam stands 20 feet tall, creates a reservoir covering 9 acres, has a maximum storage capacity of 96 acre-feet, and collects water from a drainage area of 310 square miles. Completed in 1955, 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 | St. Louis |
| Nearest City | Glencoe |
| River/Stream | Tr to Carr Creek |
| Coordinates | 38.55216, -90.62820 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 96 acre-ft |
| Max Storage | 96 acre-ft |
| Normal Storage | 51 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 310 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Lasalle Institute |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO31136 |
| Federal ID | MO31136 |
| More Info | State Dam Safety Program |