The overall teen birth rate in Missouri and Illinois fell between 20 to 29 percent, right at the national average of 25 percent.
Some towns in the stretch of river from Quincy, Ill., to Grafton, Ill., reached 10-12 feet above flood stage.
New figures from the U.S. Census Bureau estimate that Missouri gained about 13,000 residents from July 2011 to July 2012.
The National Right to Work Committee says the money will cover print and television advertising in the final week of the Missouri contest.
Missouri Sen. Roy Blunt and North Dakota Sen. John Hoeven plan to make their own inspections of the Missouri River sites.
Super Tuesday is seen as a major turning point in the 2012 Republican Presidential Primary race; Mitt Romney hopes to extend his delegate lead and finally cement his front-runner status with multiple wins across the country.