Dorlac Lake Dam
Dorlac Lake Dam is an other dam located in Washington County, Missouri, built in 1941. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Dorlac Lake Dam
The primary purpose of Dorlac Lake Dam is tailings. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted. These structures require ongoing monitoring because tailings can contain heavy metals and other contaminants. The dam is private-owned. It impounds the Tr-mineral Fork-big River near Old Mines.
The dam stands 45 feet tall and stretches 600 feet across, creates a reservoir covering 31 acres, has a maximum storage capacity of 758 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1941, the structure is well-established, with more than 75 years of service.
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 02/02/2023.
At 45 feet, this dam is taller than 91% 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 | Washington |
| Nearest City | Old Mines |
| River/Stream | Tr-mineral Fork-big River |
| Coordinates | 38.06853, -90.70689 |
Physical Characteristics
| Dam Type | Other |
| NID Height | 45 ft |
| Dam Height | 45 ft |
| Dam Length | 600 ft |
| Year Completed | 1941 (85 years old) |
Storage & Hydraulics
| NID Storage | 758 acre-ft |
| Max Storage | 758 acre-ft |
| Normal Storage | 758 acre-ft |
| Surface Area | 31 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 1,642 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Tailings |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 02/02/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO30731 |
| Federal ID | MO30731 |
| More Info | State Dam Safety Program |