Assign each group one of the following rivers on the top 13 list: Missouri River, Canning River, Eel River, Hudson River, Powder River, Mississippi River, Big Sandy River, Snoqualmie River, Animas River, East Fork Lewis, Paine Run, Hackensack River and Catawba River.

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This would narrow the comparison list to Mr. Rivers, Mr. Cutler, and Mr. Straub.

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In 1997 the services jointly withdrew a proposed rule to list Atlantic salmon in seven Maine rivers under the Endangered Species Act, resulting in a lawsuit led by the Defenders of Wildlife.

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Consider the lengthy list of personalities like Pat Sajak, Chevy Chase and Joan Rivers who have tried and failed in the host's chair.

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The report is not a list of the nation's most polluted waterways, but highlights 10 rivers facing decisions in the coming year that could determine their future.

CNN: Report lists America's 10 most endangered rivers