Russell B. Long Lock and Dam is a gravity dam located in Red River Parish, Louisiana, built in 1995. It carries a Significant hazard potential classification.
Dam profile
NID height · 110 ft110 ft tall and 681 ft long, taller than 98% 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 concrete gravity section and the water level is illustrative.
About Russell B. Long Lock and Dam
The primary purpose of Russell B. Long Lock and Dam 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 USACE - Vicksburg District (federal). It impounds the Red River near Powhatan.
The dam stands 110 feet tall and stretches 681 feet across, creates a reservoir covering 7,500 acres, has a maximum storage capacity of 70,500 acre-feet, and collects water from a drainage area of 63,350 square miles. Completed in 1995, the structure is 31 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 05/09/2023.
At 110 feet, this dam is taller than 98% of all dams in the United States.
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Location
| State | Louisiana |
| County | Red River |
| Nearest City | Powhatan |
| River/Stream | Red River |
| Coordinates | 31.93880, -93.27130 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 110 ft |
| Dam Length | 681 ft |
| Year Completed | 1995 (31 years old) |
Storage & Hydraulics
| NID Storage | 70,500 acre-ft |
| Max Storage | 70,500 acre-ft |
| Normal Storage | 70,500 acre-ft |
| Surface Area | 7,500 acres |
| Drainage Area | 63,350 sq mi |
| Max Discharge | 227,400 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Navigation |
| Owner | USACE - Vicksburg District |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 05/09/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | LA00583 |
| Federal ID | LA00583 |
| More Info | State Dam Safety Program |