Flat Top Mine-#1 Impoundment is a rockfill dam located in Jefferson County, Alabama, built in 1979. It carries a Low hazard potential classification.
Dam profile
NID height · 75 ft75 ft tall and 3,000 ft long, taller than 97% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic rockfill embankment section and the water level is illustrative.
About Flat Top Mine-#1 Impoundment
Flat Top Mine-#1 Impoundment is a dam in Jefferson, Alabama. The dam is owned by Jim Walter Resources Inc (private). It impounds the Tr-locust Fork near West Jefferson.
The dam stands 75 feet tall and stretches 3,000 feet across, and has a maximum storage capacity of 35 acre-feet. Completed in 1979, the structure is 47 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
At 75 feet, this dam is taller than 97% of all dams in the United States.
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Location
| State | Alabama |
| County | Jefferson |
| Nearest City | West Jefferson |
| River/Stream | Tr-locust Fork |
| Coordinates | 33.66167, -87.03000 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 75 ft |
| Dam Length | 3,000 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 35 acre-ft |
| Max Storage | 35 acre-ft |
| Normal Storage | 5 acre-ft |
| Max Discharge | 115 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Jim Walter Resources Inc |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | No |
Identifiers
| NID ID | AL01519 |
| Federal ID | AL01519 |
| More Info | ASDSO on Alabama (no state dam safety program) |