Subject: Cravel quality in spawning channels

From: [email-masked]
Date: Fri, 16 Jun 1995 12:09:05 -0700

In designing spawning channels for chum salmon, we (WDFW) have been using 
clean, washed rounded gravel of the following gradation:

     40%   1/4" - 3/4"
     45%   3/4" - 1 1/2"
     15%   1 1/2" - 3"

One of the biologists here has heard that the Canadians are finding increased
egg-to-fry survival when pit- or river-run material is used.  Can anyone 
corroborate this and provide a citation or contact so that I can follow up??

Thanks,

Kevin Lautz, PE
Habitat Program
Washington Department of Fish and Wildlife