Statistics for Rivers of the USA

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Rank	Hint	Answer	% Correct
2	River of Tom Sawyer	Mississippi	100%
1	Longest river in North America, tributary of #2	Missouri	96%
5	Very little of this river's water actually reaches its mouth	Colorado	92%
11	Don't mistake this river for the longer #5	Colorado of Texas	92%
10	Two rivers go into Pittsburgh, this one comes out	Ohio	88%
4	Illegal immigrants cross this river	Rio Grande	85%
3	Part of the "rich man's route" to the Klondike	Yukon	73%
6	Second longest tributary of #2	Arkansas	71%
7	Two famous explorers reached the ocean at this river's mouth	Columbia	69%
8	But remember this colorful river's valley in a famous cowboy song	Red	65%
12	Flows from Knoxville, through a state with the same name, to #10	Tennessee	52%
9	Flows through the deepest canyon in North America	Snake	46%
13	Curiously, this river does not even flow through Canada	Canadian	42%
15	Powell floated this colorful river before #5	Green	42%
16	Longest tributary of #4, shares its name with a fictional cowboy	Pecos	33%
17	Several rivers of this colorful name flow around the country, but this Arkansas-Missouri river is the longest	White	29%
14	Longest river entirely in Texas	Brazos	27%
20	Namesake of a particularly dangerous shortcut on the Santa Fe Trail	Cimarron	8%
18	Sometimes called the Dakota River, it empties into #1	James	8%
19	Longest river entirely in Alaska, it is not a tributary of #3	Kuskokwim	0%