Profile Data Sources: U.S. Corps of Engineers; U.S. Census 2000; Federal Highway Administration Highway Statistics; U.S. Department of Transportation, Airport Activity Statistics of Certified Air Carriers; Transportation Commodity Flow Survey, U.S. Census Bureau, 1997; 2002 Economic Census; Federal Railroad Administration, Office of Safety Analysis Web site; U.S. Department of Transportation, Office of Bridge Technology's Web site; U.S. Department of Transportation, Federal Aviation Administration, aircraft registration's Web site; U.S. Department of Energy, MER database; various Iowa DOT databases and information sources; Freight Transportation Profile-Iowa, Freight Analysis Framework, Federal Highway Administration, Office of Freight Management and Operations, November 2002; SFY 2015 Year-End Statistical Reports from Iowa’s 35 designated public transit systems, Transportation Improvement Program, Iowa Department of Transportation; Annual reports submitted by railroads operating in Iowa; Rebbie data
Page last updated: July 2009