Big Branch Impoundment is an earth dam located in Knott County, Kentucky. It carries a High hazard potential classification.
Dam profile
NID height · 304 ft304 ft tall and 1,160 ft long, taller than 99% of U.S. dams with a recorded height. Height is drawn to scale against the Statue of Liberty, 305 ft ground to torch; the profile is a generic embankment section and the water level is illustrative.
About Big Branch Impoundment
The primary purpose of Big Branch Impoundment 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 owned by Cbd Resources, Inc. (private).
The dam stands 304 feet tall and stretches 1,160 feet across, and has a maximum storage capacity of 2,617 acre-feet.
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. An emergency action plan is in place for this dam.
At 304 feet, this dam is taller than 99% of all dams in the United States.
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 Kentucky 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 | Kentucky |
| County | Knott |
| Nearest City | Raven |
| Coordinates | 37.38389, -82.80917 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 304 ft |
| Dam Height | 304 ft |
| Dam Length | 1,160 ft |
Storage & Hydraulics
| NID Storage | 2,617 acre-ft |
| Max Storage | 2,617 acre-ft |
Ownership & Safety
| Purpose | Tailings |
| Owner | Cbd Resources, Inc. |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | KY00835 |
| Federal ID | KY00835 |
| More Info | State Dam Safety Program |