Hi, Jody,

In addition to Birds of the World, for a different perspective, obviously dated, but surprising in its variable depth and quirkiness, if I'm still missing information it's worth checking Bent's Life Histories.  You can find them here.
http://birdaz.com/blog/basic-references-north-america/

Some of the other references on that page may help, as well.  For example, in Bendire's Life Histories at
https://www.biodiversitylibrary.org/item/50299#page/316/mode/1up
on page 300 is mention of finding a Western Flycatcher nest on a low rafter in a barn, somewhat similar to your find. 

For your bird, Bent's Flycatchers, etc., is at

http://www.biodiversitylibrary.org/item/32702#page/5/mode/1up
Species limits have changed, so for Pacific-slope you'd want to check Western Flycatcher and maybe San Lucas Flycatcher accounts, pages 246-54.  

Cheers,

Alan Grenon
Seattle
panmail AT mailfence.com

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