Tyrolean Traverse,
Squamish River

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Mark Dale's brush and bushwack rating system can be extended to include river crossing aids. Crossing by trolley is A1. By boat is A2. By tyrolean traverse (when the trolley is locked) is A3. Here Carl Skoog crosses the Squamish River in the Tantalus Range, B.C.

Can the grades be pushed higher? Swinging across Tarzan-style might qualify as A4. Certainly A5 would require great ingenuity and courage. A catapult?

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