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.
For the unincorporated community in Adams County, see Spring Valley, Adams County, Illinois. Spring Valley is a city situated on the Illinois River in Bureau County, Illinois. The population was 5,398 at the 2000 census, and 5,558 at the 2010 census. It is part of the Ottawa â Streator Micropolitan Statistical Area.