Studies on Aedes Vexans (Meig.) and Aedes Sticticus (Meig.), Flood-Water Mosquitoes, in the Lower Columbia River Valley

Abstract

The annual spring floods of the Columbia River usually inundate thousands of acres of open and wooded lowlands along its borders below Bonneville Dam for a distance of about 60 miles or more up and down the river from Vancouver, Wash., and Portland, Oreg. The Willamette River floods smaller areas for about 15 miles above the point where it joins the Columbia, and considerable backing up of water occurs near the mouths of smaller tributaries in this region. The area that flooded above the site of the Bonneville Dam before it was built is now permanently covered with water (Stage, 1943).