Grand Bayou Flood Control Structure


South Lafourche Levee District


GIS Engineering

Date of Completion

October 1, 2021

General Contractor

Sealevel Construction

Project Overview

Sealevel Construction was awarded the general contract to complete the Grand Bayou Flood Control Structure, a critical flood control structure a part of the Morganza to the Gulf Hurricane Protection System. With nearly 46,000 man-hours on this project, Sealevel self-performed about 98% of the project’s scope of work, which included:

  • Installation of 58,320 vertical and 1,800 horizontal wick drains
  • Construction of (2) 44’ x 80’ earthen levees
  • Installation of approximately 5,200 CY of abutments on each side of flood wall
  • Installation of a flood wall that consists of plumb and battered steel pipe piles and sheet piles
  • Installation of timber piles clusters and timber guide walls
  • Installation of a barge gate
  • Fabrication and installation of (2) 140’ long by 22’ tall jacket receiving structures

In addition to the contracted work, Sealevel Construction also installed a temporary emergency barge to protect the surrounding communities from hurricane storm surge. The emergency work included:

  • Installation of 80’ x 260’ x 22’ temporary barge
  • Installation of (32) pipe piles with 30” diameters and up to 120’ long
  • Placement of 1,250 sandbags
  • Placement of 1,200 tons of 650 lb rip rap

Collectively, the flood control structure provides approximately 524 linear feet of flood protection. Though Sealevel Construction was met with several challenges in terms of schedule changes and soil conditions, the team completed the 21-million-dollar project ahead of schedule, under budget and with zero safety incidents.