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随着太平洋加州海岸的港口日渐饱和，一些远洋国际贸易公司将货物转而由波特兰港进入。哥伦比亚河的航运能力又得到了新的利用。为了使得大型集装箱货轮能够顺利进入，俄勒冈州的河流管理部门在21世纪初对哥伦比亚河进行了新一轮的疏浚工程，增加了哥伦比亚河下游流域的河道水深。<ref>{{Cite news|url=http://www.oregonlive.com/business/index.ssf/2010/04/columbia_river_dredging_ends_t.html|title=Columbia River dredging ends this year, benefits end mixed|date=2010-04-24|accessdate=2015-02-03}}</ref>
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==参考文獻==
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