| Rank | Length (km) | River | % Correct |
|---|---|---|---|
| 8 | 498 | Platte River | 94%
|
| 1 | 3,767 | Missouri River | 93%
|
| 2 | 1,152 | North Platte River | 59%
|
| 4 | 914 | Niobrara River | 57%
|
| 6 | 707 | South Platte River | 51%
|
| 9 | 470 | Elkhorn River | 49%
|
| 5 | 729 | Republican River | 35%
|
| 3 | 933 | White River | 17%
|
| 7 | 578 | Big Blue River | 3%
|
| 10 | 447 | Lodgepole Creek | 2%
|