At Nisqually, the dikes will be removed soon and tidal processes restored to 750 acres of wetland that still retain some of the 19th century tidal channels. Removal of the dikes means loss of the loop trail - although new paths will still allow access to the restored delta. New dikes will maintain some freshwater areas -- and protect the Refuge headquarters from rising sea level? (I put some additional pictures at hshipman.blogspot.com).
One of the interesting questions that came up recently was the history or purpose of the bench that lies along the saltwater side of much of the main dike - is this an earlier dike or a feature built to allow construction of the dike or a protective berm to protect the main dike from erosion? It represents lots of work, and lots of dirt, and will need to be removed in addition to the main dike to assure that natural drainage is restored to the delta.
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