Lost Valley Lake Dam #2
Lost Valley Lake Dam #2 is an earth dam located in Gasconade County, Missouri, built in 1998. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Lost Valley Lake Dam #2
The primary purpose of Lost Valley Lake Dam #2 is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lost Valley Lake Resort (private). It impounds the Big Branch.
The dam stands 42 feet tall and stretches 800 feet across, creates a reservoir covering 43 acres, has a maximum storage capacity of 913 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1998, the structure is 28 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 08/03/2021.
At 42 feet, this dam is taller than 89% 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 | Gasconade |
| River/Stream | Big Branch |
| Coordinates | 38.46898, -91.40555 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 42 ft |
| Dam Height | 42 ft |
| Dam Length | 800 ft |
| Year Completed | 1998 (28 years old) |
Storage & Hydraulics
| NID Storage | 913 acre-ft |
| Max Storage | 913 acre-ft |
| Normal Storage | 480 acre-ft |
| Surface Area | 43 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 3,050 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | LOST VALLEY LAKE RESORT |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/03/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO40144 |
| Federal ID | MO40144 |
| More Info | State Dam Safety Program |