9. Portland, Ore. offers walkers a Pedestrian Advisory Committee made up of residents who has worked with City Council on transportation issues for the past 10 years.

The Willamette River threatens to flood downtown <a class="taxInlineTagLink" id="PLGEO100100204141250" title="Portland (Multnomah, Oregon)" href="/topic/us/oregon/multnomah-county/portland-%28multnomah-oregon%29-PLGEO100100204141250.topic">Portland</a> in <a class="taxInlineTagLink" id="PLGEO1001040000000000" title="Oregon" href="/topic/us/oregon-PLGEO1001040000000000.topic">Oregon</a> in February 2009.

( Dan Levine/AFP/Getty Images / July 13, 2012 )

The Willamette River threatens to flood downtown Portland in Oregon in February 2009.

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