From the news release by US Customs and Border Protection last November:
This project includes the construction and installation of tactical infrastructure including a reinforced concrete levee wall to the height of the existing levee, 18-foot tall steel bollards installed on top of the concrete wall, and vegetation removal along a 150-foot enforcement zone throughout the approximately eight miles of levee wall system. The levee wall system will include detection technology, lighting, video surveillance, and an all-weather patrol road parallel to the levee wall.
