The image above came from p. 4 of Portland's Willamette River Atlas, and it shows a fascinating comparison of the lower Willamette River in 1888 (left) and 2001. This map shows the significant hydrologic and topographic changes to the river over the past 150 years.
Allow your eyes to go back-&-forth between these two images and you'll see how we have filled-in lakes, covered-over streams, and channelized the main stem of the river. Check out all of the former lakes at the northern limits of Portland and on the north Portland peninsula -- nowadays, most of these are gone!
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