Thanks for the comment.

So in this area, South Louisiana, dredging is not environmentally unfriendly at all. Remember all of South Louisiana was built by sediment from the Mississippi River over thousands of years. So moving (dredging) that material from one place to another is the natural way. Man is doing with dredges what nature would do with the force of the River. If humans hadn't leveed up the Mississippi River nature would be moving the sediment all over South Louisiana. The River would silt in so much that it would change course, over and over again. The levees are the only reason that the River is still where it is now.

The biggest environmental problem in South Louisiana is that the land was built by the sediment from the Mississippi River, and bc of the levees, the wetlands are now cut off from the sediment rich fresh water that the River carries. With erosion, the natural sinking process of the organic soil, and sea level rise, Louisiana is disappearing into the water. Fresh water diversions from the River is my preferred solution, but dredging is helpful too. The area can use all the land building help it can get!

I can't speak to the California Oregon and Washington areas, I don't know enough about it, maybe there are reefs that would be damaged.....??