Originally Posted by Pacifictimes
Where can I find the turbidity of the Columbia around the Portland area?
You can't. You can get turbidity at Bonneville, here
, and at the Morrison bridge here
. You can figure out what the rest of the river is going to look like by watching these numbers and the heights of the Lewis and the Cowlitz. The Columbia at St Helens and Kalama will fish nicely this weekend, based on my readings of these numbers currently, unless the Willamette spikes again.
I look at the outflow over Bonneville, which is about 130,000 cfs right now, and is quite clear. The willamette is at about 80,000 cfs. The willamette's turbidity is about 20, which is almost fishable itself. The blending of these waters will average out to a turbidity of about 8, which is just fine.
The Bonneville turbidity numbers use a different measure than the Willamette numbers, so they aren't directly comparable.
Hope that helps.