At The Mouth: The full strength of the river's 1,250 miles meets strong winds and the power of the Pacific Ocean at its mouth where the river is over two miles wide. Here, large bays open on both the north and south shores, and numerous islands change in size with the tidal flows. Birds, wildlife, deep forests, and light can all be dramatic or absolutely still, and are in constant change through the seasons.
Portland-Vancouver: Upstream of Portland, the river spills from the confinements of the Columbia Gorge. It becomes more a working river here, and the Willamette River joins it. On the city's northwest edge Sauvie Island offers quieter spaces for both humans and wildlife.
Eastern Washington: On the east side of the Cascades, upriver of The Dalles, the vegetation along the Columbia River changes dramatically. Thick forests give way to sagebrush, open hillsides, and a variety of colorful plants in the spring.