This video was taken from a bridge crossing the Columbia River just downstream of the Dalles Dam.  Every spring and summer water is spilled over Columbia River dams to facilitate downstream passage of juvenile salmon.  This year, together with the Aquatic Ecology lab, our group is studying the impact of this spill on river chemistry and ecology, including greenhouse gas production.  Other collaborators on the same project will be examining how river management affects how people value land perceive the river and its ecosystem services.