| mi | River | % Correct |
|---|---|---|
| 1,243 | Columbia River | 95%
|
| 1,078 | Snake River | 81%
|
| 302 | Willamette | 43%
|
| 111 | Spokane River | 33%
|
| 214 | Yakima River | 32%
|
| 102 | Boise River | 29%
|
| 61 | Walla Walla River | 20%
|
| 252 | Deschutes River | 17%
|
| 95 | Lewis River | 17%
|
| 425 | Salmon River | 16%
|
| 485 | Kootenay River | 14%
|
| 90 | McKenzie River | 13%
|
| 53 | Wenatchee River | 12%
|
| 83 | Clackamas River | 11%
|
| 190 | Malheur River | 11%
|
| 310 | Clark Fork | 10%
|
| 105 | Cowlitz River | 10%
|
| 158 | Flathead River | 10%
|
| 284 | John Day River | 10%
|
| 115 | Okanogan River | 10%
|
| 280 | Owyhee River | 10%
|
| 89 | Umatilla River | 10%
|
| 272 | Clearwater River | 9%
|
| 130 | Pend Oreille River | 9%
|
| 172 | Elk River | 8%
|
| 212 | Grande Ronde River | 8%
|
| 83 | Payette River | 8%
|
| 12 | Santiam River | 8%
|
| 175 | Kettle River | 7%
|
| 92 | North Santiam River | 7%
|
| 69 | South Santiam River | 7%
|
| 153 | Bruneau River | 5%
|
| 125 | Crooked River | 5%
|
| 128 | Duncan River | 5%
|
| 80 | Methow River | 5%
|
| 167 | Palouse River | 5%
|
| 137 | Big Wood River | 4%
|
| 98 | Burnt River | 4%
|
| 127 | Henry Fork | 4%
|
| 39 | Illecillewaet River | 4%
|
| 70 | Lochsa River | 4%
|
| 92 | Middle Fork | 4%
|
| 124 | Portneuf River | 4%
|
| 100 | Selway River | 4%
|
| 37 | Slocan River | 4%
|
| 66 | South Fork | 4%
|
| 163 | Crab Creek River | 3%
|
| 65 | Granby River | 3%
|
| 50 | Kicking Horse River | 3%
|
| 68 | Priest River | 3%
|
| 108 | Raft River | 3%
|
| 122 | Similameen River | 3%
|