There's one feeder creek on the south fork just above verlot that's causing most of the color. It's clay so it's not settling out and the river stays dirty all the way down.
The north fork gets puked on pretty hard in the Oso area. Deer Creek does its part, then just upstream from there it's Montague Creek and one smaller stream. The Boulder River's been experiencing slides in the last year too.
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If anybody needs me, I'll be on the river.