Thanks to Harry Nehls for the information on GWFG migration. The next
question, then, is: do these south-bound migrants tend to stay to the east of
Vancouver Island (ie. over the Fraser River delta, Puget Sound, etc.) or do
they somehow cross over to the outside coast of the Island and Olympic
Peninsula?

We see them over Victoria and resting at Cowichan Bay (Duncan) most springs,
but their southward (fall) movements usually go unnoticed here. I have only
unconfirmed reports of s. movements on the west coast of the Island.

Bryan Gates, Victoria bgates at assessment.env.gov.bc.ca