| Hint | Answer | Length (in kms) | Length (in mi) | % Correct |
|---|---|---|---|---|
| 2 | Mississippi River | 3 544 km | 2 202 mi | 97%
|
| 1 | Missouri River | 3 768 km | 2 341 mi | 92%
|
| 5 | Colorado River | 2 330 km | 1 450 mi | 86%
|
| 10 | Ohio River | 1 575 km | 979 mi | 86%
|
| 11 | Colorado River (Texas) | 1 560 km | 970 mi | 85%
|
| 7 | Columbia River | 2 000 km | 1 243 mi | 71%
|
| 34 | Red River (North) | 887 km | 550 mi | 69%
|
| 8 | Red River (South) | 1 811 km | 1 125 mi | 69%
|
| 6 | Arkansas River | 2 322 km | 1 443 mi | 67%
|
| 9 | Snake River | 1 674 km | 1 040 mi | 67%
|
| 12 | Tennessee River | 1 504 km | 935 mi | 60%
|
| 3 | Yukon River | 3 190 km | 1 979 mi | 57%
|
| 26 | Saint Lawrence River | 965 km | 602 mi | 44%
|
| 15 | Green River | 1 230 km | 760 mi | 34%
|
| 22 | Yellowstone River | 1 091 km | 678 mi | 34%
|
| 16 | Pecos River | 1 175 km | 730 mi | 30%
|
| 4 | Grande River | 2 830 km | 1 759 mi | 25%
|
| 14 | Brazos River | 1 390 km | 860 mi | 24%
|
| 13 | Canadian River | 1 458 km | 906 mi | 24%
|
| 27 | Gila River | 960 km | 600 mi | 23%
|
| 21 | Cumberland River | 1 120 km | 696 mi | 21%
|
| 38 | Wabash River | 810 km | 503 mi | 21%
|
| 17 | White River (Arkansas) | 1 159 km | 720 mi | 21%
|
| 36 | White River (Missouri) | 816 km | 507 mi | 21%
|
| 18 | James River | 1 140 km | 710 mi | 19%
|
| 23 | North Platte River | 1 070 km | 665 mi | 17%
|
| 37 | Trinity River | 815 km | 506 mi | 12%
|
| 24 | Milk River | 1 005 km | 625 mi | 10%
|
| 35 | Des Moines River | 845 km | 525 mi | 9%
|
| 20 | Cimarron River | 1 123 km | 698 mi | 8%
|
| 33 | Sabine River | 890 km | 553 mi | 7%
|
| 19 | Kuskokwim River | 1 130 km | 702 mi | 5%
|
| 31 | Niobrara River | 914 km | 568 mi | 3%
|
| 25 | Ouachita River | 974 km | 605 mi | 3%
|
| 32 | Little Missouri River | 900 km | 560 mi | 2%
|
| 30 | Smoky Hill River | 927 km | 576 mi | 1%
|
| 29 | Tanana River | 940 km | 584 mi | 1%
|
| 28 | Sheyenne River | 951 km | 591 mi | 0%
|