DCHP-1 Online
interval(e) island Obs. 
an island caused by the settling of alluvial soils behind some obstruction in a river.
- 1846 The intervale islands in the rivers appear, generally, to have been made by trees and other substances grounding on shoals.
- 1846 The intervale islands in the rivers appear, generally, to have been made by trees and other substances grounding on shoals.