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Oregon Caves National Monument Testing the pH of Oregon Caves' watershed
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Oregon Caves National Monument
Park Statistics
Visitation at Oregon Caves, 2001-2010

Annual Monument Visitation

Year   Visitors

2010 83,132

2009 83,208

2008 73,774

2007 76,966

2006 78,900

2005 83,811

2004 83,701

2003 94,745

2002 84,520

2001 87,175

For more complete statistics, visit www.2nature.nps.gov.stats.

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Acid dew dissolves the cave wall to make small pock marks.

Did You Know?
Carbon dioxide mixes with water that condenses on the wall of the cave to create a very weak acid. Over long periods of time this "acid dew" eats away at the marble walls of Oregon Caves making the cave larger.
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Last Updated: November 22, 2010 at 11:48 MST