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I'm thinking out loud here, but Hangman creek enters the system just below Spokane. It travels through Long lake which at that point should sediment out all the discoloration of Hangman.......Any discoloration is going to happen below Long lake dam and Little Falls dam. I'm not sure what happens downstream of that?
It depends on where you are seeing the mud, where did you see it? What about Hawk creek it flows through farm lands then dumps right into the lake.