Nice sighting and video.
Only Swainson's Hawks I have seen on the west side of the Cascades in WA
were both adults, both in late April, both on the Highway 20 intermediate
grass strip just west of the Farmhouse Inn in different years.
A third one was a juvenile (SY) I caught and banded at Sea-Tac Airport 11
May last year.
I would call your bird an adult based on the dark terminal tail band and
clear underwing coverts.
I wonder if we are seeing more moving through here in spring or just more
people are becoming aware of them?

Bud Anderson
Falcon Research Group
Box 248
Bow, WA 98232
(360) 757-1911
falconresearch at gmail.com
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