Suggested citation and version history for: Hamill, John F., 2009, Status and trends of resources below Glen Canyon Dam update--2009: U.S. Geological Survey Fact Sheet 2009-3033, 4 p. [http://pubs.usgs.gov/fs/2009/3033/]. Version 1.0, April 27, 2009 Initial release online at http://pubs.usgs.gov/fs/2009/3033/