LOWER COLUMBIA RIVER WATERSHED COUNCIL

subarea 4 priorities: Deer island area

Deer Island is a discrete subarea formed in the Lower Columbia floodplain. It is bisected by a large slough channel that historically used to be connected to tidal and fluvial inundation patterns. Much of its topography are bar and scroll landforms shaping wetland back swamps in lower areas. This type of landform is developed from overbank flood events from the Columbia river before the federal hydropower system was put in place. Current Deer Island hydrology is sourced primarily from Tide and Merrill Creek drainage areas that have been rerouted from their former channels to facilitate agricultural development on the island.

Contributing Areas: Tide Cr., Merrill Cr., McBride Cr., Deer Island, Sandy Island, Goat Island