During design of the Portland District’s new Bonneville Navigation Lock, INCA developed design concepts for a 1,200-foot long, 130-foot deep guard / retaining wall system with built-up steel closure sections. The structure was successfully installed in 1991.

Following its success, INCA designed the first-of-its-kind fixed and floating guide wall for the new lock, incorporating a composite steel/concrete impact face. Word spread within the Corps, and since that time, INCA has provided engineering services at more than 30 navigation locks maintained by U.S. Army Corps of Engineers districts nationwide.

INCA’s work included innovative design and construction techniques such as float-in and lift-in technology to reduce construction costs, state-of-the-art soil/structure interaction for severe seismic conditions, and three-dimensional finite element analyses of complex structures.

Representative Projects:

• Bonneville Lock Fixed and Floating Guide Wall
  
• Charleroi Lower Floating Guard Wall
• Chickamauga Lock Replacement Upstream - Downstream Approach Walls
• Kentucky Lock Addition Floating Caisson
• Olmsted Lock and Dam Approach Walls
• Upper Mississippi Lock 22 and 25 Concept Study
• Marmet Lock Upstream Guard Wall Replacement