GIWW Bypass Barge Gate Keel Slab

The GIWW Bypass barge is a part of the U.S. Army Corps of Engineers upgraded flood control infrastructure for New Orleans, Louisiana. The barge approximately 200 feet long by 60 feet wide and is constructed of lightweight concrete. When a flood event occurs the barge is moved into the channel and sunk to create a flood barrier. At the end of the flood event the barge is pumped out and pulled out of the channel to reopen the channel for shipping.

CTLGroup was retained by the prime contractor, Shaw Environmental & Infrastructure Group, to locate areas of poor concrete consolidation on the bottom of the barge. CTLGroup performed Impulse Response and Impact- Echo testing on the underside and topside of the barge keel slab. Areas of poorly consolidated concrete, unsound repairs, and variations in the lightweight concrete properties were located. The poorly consolidated concrete and unsound repairs areas were removed and replaced and the variations in lightweight concrete properties were evaluated through compressive strength testing and petrography. Based on our nondestructive testing and laboratory work conclusions regarding the long term durability of the barge were developed.


Civil Infrastructure

Consulting Services

Leakage Investigation & Repair

Corrosion Science

Structural Engineering + Evaluation

Non-Destructive Evaluation

Repair, Restoration, Retrofit

Structural Condition Assessment

Structural Health Monitoring

Validation of Structural Behavior

Vibration Monitoring, Analysis, and Mitigation

Laboratory Services

Concrete + Cement-Based Materials

Microscopy / Petrography

Durability & Service Life

Durability & Service Life Testing


Physical Testing of Concrete + Mortar

Specialized Testing

The Inner Harbor Navigation Canal Lake Borgne Surge Barrier was constructed to reduce the risk of storm damage to some of the New Orleans region's most vulnerable areas.


Project Completion

1.8 Mi


45 Ft

Gate Height

Learn more about this project

Project Detail Form

Project Detail Form