Jonesville Lock And Dam
Jonesville Lock And Dam is a gravity dam located in Catahoula Parish, Louisiana, built in 1972. It carries a Significant hazard potential classification.
About Jonesville Lock And Dam
The primary purpose of Jonesville 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 Black River near Simmesport.
The dam stands 94 feet tall and stretches 920 feet across, creates a reservoir covering 7,120 acres, has a maximum storage capacity of 149,300 acre-feet, and collects water from a drainage area of 24,200 square miles. Completed in 1972, the structure is well into its service life at over 50 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 02/16/2022.
At 94 feet, this dam is taller than 98% of all dams in the United States.
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Location
| State | Louisiana |
| County | Catahoula |
| Nearest City | Simmesport |
| River/Stream | Black River |
| Coordinates | 31.48269, -91.85955 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 94 ft |
| Dam Length | 920 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 149,300 acre-ft |
| Max Storage | 149,300 acre-ft |
| Normal Storage | 123,700 acre-ft |
| Surface Area | 7,120 acres |
| Drainage Area | 24,200 sq mi |
| Max Discharge | 176,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Navigation |
| Owner | USACE - Vicksburg District |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 02/16/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | LA00175 |
| Federal ID | LA00175 |
| More Info | State Dam Safety Program |