Much of the colour comes from culliton creek, a tributary of the middle cheakamus. It blows out very quickly.
But I have noticed that the mainstem Cheakamus, even in the upper regions, has taken longer to clear up than in previous years. Different people have different theories. I think, at least partially, that the late summer starts and heavy snow packs we've had the last two years aren't helping.
But we did have some very heavy sustained rainfall at the beginning of October as well, and that pushed levels up substantially.