Small unsteady spoil banks/ levees can be built up to form a 'bowl' shape. Then with the help of dredges, soil can be pumped in and marsh grasses planted. Once the marsh grasses build up, levees will begin to collapse creating a new vegetated marsh area.
Worden is a village in Madison County, Illinois, United States.
Alden, O. &. C., Bracher, W. & Bourquin, F. (1891) Plat book of Mason County, Illinois. Chicago: Alden, Ogle & Co. [Map] Retrieved from the Library of Congress, https://www.loc.gov/item/2006628625/. Alden, Ogle & Company, Wm Bracher, and F Bourquin. Plat book of Mason County, Illinois.