Pearl River Lock 1 and Spillway is a concrete dam located in St. Tammany Parish, Louisiana, built in 1949. It carries a Significant hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 200 ft long. 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 Pearl River Lock 1 and Spillway
The primary purpose of Pearl River Lock 1 and Spillway is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by USACE - Vicksburg District (federal). It impounds the Pearl River Canal near Pearl River.
The dam stands 15 feet tall and stretches 200 feet across, creates a reservoir covering 107 acres, has a maximum storage capacity of 3,400 acre-feet, and collects water from a drainage area of 7,960 square miles. Completed in 1949, the structure is well-established, with more than 75 years of service.
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. The most recent inspection on record was 11/02/2016.
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Location
| State | Louisiana |
| County | St. Tammany |
| Nearest City | Pearl River |
| River/Stream | Pearl River Canal |
| Coordinates | 30.47167, -89.79333 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 15 ft |
| Dam Length | 200 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 3,400 acre-ft |
| Max Storage | 3,400 acre-ft |
| Normal Storage | 3,400 acre-ft |
| Surface Area | 107 acres |
| Drainage Area | 7,960 sq mi |
| Max Discharge | 4,200 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | USACE - Vicksburg District |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 11/02/2016 |
| Emergency Action Plan | No |
Identifiers
| NID ID | LA00089 |
| Federal ID | LA00089 |
| More Info | State Dam Safety Program |