[Natural Light Kid]

Originally Posted by Duck Butter

You don't have to buy into the manmade global warming, but you need to be aware that the sea levels are rising (due to polar ice caps melting), our land is subsiding (due to numerous things, mainly manmade levees, causing lack of sediment, freshwater, etc.) and saltwater is getting further and further into our marshes and will for the forseeable future, its much bigger than a weir keeping someone from going crabbing or catching some redfish. Much much bigger than that.

The ship channel was dug for the shipping industry in Lake Charles. Without the ship channel, Lake Charles wouldn't be much of anything, it relies on the shipping industry. The saltwater barrier was put in place over 50 years ago to mitigate for this. Weirs were installed later. Its that simple

Very nicely put.