Both of y'alls' comments help me feel a little better about the distances. However, I will probably end up switching my route anyway, more-so for the likely high water levels than anything, but the alternate also has shorter distances and less elevation change. I've been watching the water gauge in Langley like a hawk and come to the conclusion that it takes about 72 hours straight of no rain to get down to a comfortably safe water level. The hike starts Friday morning, so there would have to be no rain from at least Tuesday morning through Friday afternoon to ford the worst of the crossings.
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The journey is more important than the destination.