"Table 1: Number of Highway Bridges by Owner, 1996-2006",,,,,,
Owner,1996,1998,2000,2002,2004,2006
Federal,"6,250","7,452","8,010","9,049","8,425","8,355"
State,"273,247","274,263","277,076","280,216","282,527","284,668"
Local,"299,125","298,280","298,791","299,275","300,385","301,912"
Private/railroad,"2,382","2,283","2,275","1,501","1,479","1,490"
Unknown/unclassified,484,441,415,400,397,375
Total,"581,488","582,719","586,567","590,441","593,213","596,800"
"NOTE:  Numbers include the 50 U.S. states, the District of Columbia, and Puerto Rico.",,,,,,
"SOURCE: U.S. Department of Transportation, Federal Highway Administration, National Bridge Inventory, Highway Bridges by Owner, various years. http://www.fhwa.dot.gov/bridge/owner.htm as of Aug. 14, 2007.",,,,,,