Lock and Dam No 8 is a gravity dam located in Union County, Arkansas, built in 1911. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 334 ft long, taller than 50% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Lock and Dam No 8
The primary purpose of Lock and Dam No 8 is navigation. The dam maintains water levels sufficient for boat and barge traffic, supporting commercial or recreational navigation on the waterway. The dam is owned by Daen Lmk (federal). It impounds the Ouachita River.
The dam stands 25 feet tall and stretches 334 feet across, and has a maximum storage capacity of 85,000 acre-feet. Completed in 1911, the structure is over a century 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.
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Location
| State | Arkansas |
| County | Union |
| Nearest City | None |
| River/Stream | Ouachita River |
| Coordinates | 33.30167, -92.46333 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 334 ft |
| Year Completed | 1911 (115 years old) |
Storage & Hydraulics
| NID Storage | 85,000 acre-ft |
| Max Storage | 85,000 acre-ft |
| Normal Storage | 59,200 acre-ft |
| Max Discharge | 6,500 cfs |
Ownership & Safety
| Purpose | Navigation |
| Owner | Daen Lmk |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | AR00156 |
| Federal ID | AR00156 |
| More Info | State Dam Safety Program |