Traveler's Guide
Travelers Guide to the Firearms Laws of the Fifty States is published each January in both paperback and electrionic versions.
It can be ordered direct from the publisher online using link below for retail price.
US Concealed Carry Assn
United States Concealed Carry Association Concealed Carry Maps are updated regularly.
California & Colorado
Colorado recognizes ONLY state permits when the other state recognizes Colorado's permit and then ONLY for resident permits.
Oregon does NOT recognize ANY other state's permits, therefore it is impossible to legally carry concealed there.
California barely recognizes it's own permits (CCW) and those are issued ONLY to CA residents on a "May Issue" basis. It depends on the county sheriff where you reside. NO non-resident permits issued.
Restricted Firearms
There are some states, such as Californina that merely possessing certain types of firearms and/or magazines is a felony.
Just because it is legal to buy and own in Oregon does not mean you can even possess it in California.
Examples: AR style rifles with push button magazine releases
ANY magazines that hold more than 10 rounds of ammo