This is the exact lineage my mother has, to Oregon and ends in Tennessee where your trail begins-on the Edwards side.
My mother Kristy Arneson's mother was Melba Edwards Arneson and her father was Arne Otto Arneson.
My mother was raised in Ventura,CA .Her brother, my Uncle Eric Arneson, resides in Santa Barbara, CA. We have little on the Arneson history at this time. I will look into some papers I have that have coat of arms, etc for my grand father Arne Otto Arneson.