Chief was the brand for Wasatch Oil Co. of Utah,
marketed in Washington, Oregon, Montana, and Idaho.
They were bought by Phillips 66 in 1947 and rebranded.
Thanks to Wayne Henderson for this info.
Photo donated by Dave Leach.
Note: Big graphics ahead... Please be patient.
Map scan from Dave Leach.
1940 map scan from Dave Leach.
1948 map scan from Dave Leach.
Big Chief from Dave Leach.
Newer-looking Chief sign on AR 10 in Little Rock, Arkansas.
Taken 9-26-2004 by David Backlin.
No station... all that remains is this sign.
I don't think this is related to the above Chief brand.