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| Longest North American Rivers |
| Rank |
River |
Country |
Miles |
| 1 |
Mackenzie |
Canada |
2,635 |
| 2 |
Missouri-Red Rock |
US |
2,540 |
| 3 |
Mississippi |
US |
2,348 |
| 4 |
Missouri |
US |
2,315 |
| 5 |
Yukon |
US |
1,979 |
| 6 |
St. Lawerence |
Canada |
1,945 |
| 7 |
Rio Grande |
US |
1,760 |
| 8 |
Nelson |
Canada |
1,600 |
| 9 |
Arkansas |
US |
1,459 |
| 10 |
Colorado |
US |
1,450 |
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River Classifications
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Class I - Easy
Waves small, passages clear; no serious obstacles.
Class II - Medium
Rapids of moderate difficulty with passages clear.
Class III - Difficult
Waves numerous, high, irregular; rocks; eddies; rapids with passages clear
though narrow, requiring expertise in maneuvering.
Class IV - Very Difficult
Long rapids; waves powerful, irregular; dangerous rocks; boiling eddies; powerful
and precise maneuvering required.
Class V - Extremely Difficult
Exceedingly difficult, long and violent rapids, following each other almost without interruption;
riverbed extremely obstructed; big drops; violent currents; very steep gradient. Most rafting tour
operators require testing and prior Class IV or better whitewater experience.
Class VI - Unrunnable
Just like it says - Don't even think about it!
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