who raised the question and God bless their pointy head ------ I have drift  
dived many streams and small rivers and have never observed any exceptional  
behavior by salmonids except a careful cautionary gaze and a tendency to keep  
their comfort distance ---- if your divers want to chase the sockeye that 
would  probably tire them some and waste air --- so don't do that
 

I am  working on a project that will replace some anchor cables on the
two  floating bridges that cross Lake Washington in Seattle, Washington.
The  project will use a pair of divers to replace these cables in water
from 40  to 200 feet deep.  Lake Washington is the largest lake in
Western  Washington, and supports a number of salmonid species, including
anadromous  sockeye.  Adult sockeye are known to find thermal refuge at
50 to 90  feet deep during the warmest part of the summer, and this
season the  population is expected to be 105,000.

A question has arisen on the  potential impact that two divers would have
on these fish, and I am at a  loss to find a source of information.  Does
anyone know, or can anyone  provide best professional judgment, on the
potential impact of a pair of  divers moving vertically through the
thermal refuge layers where sockeye  would be dispersed?  

Brian Bigler 
NW Region Biology Program  Manager
Washington State Department of Transportation 
Seattle, WA  
Direct: 206-440-4519 
Cell:    206-919-1610 
FAX:   206-440-4805 






Russell
Nelson Resources Consulting, Inc.
954 653  8295
561 449 9637
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