With the rains we had this past evening the visibility in the main river has dropped to about 6 inches. Both of the forks are dropping at the present time and the river should be in better fishing shape in the next day or so (Providing we don't get much in the way of rainfall).
It doesn't take much to put the south Fork out of shape and in turn the main stem.
You might go fish the Skykomish or the Snohomish (though it colored up a tad from last night also).