Is this a barn spider
Thank you for the nice picture. It is not a barn spider - specifically, it is not the species (Araneus cavaticus) that was the inspiration for Charlotte of Charlotte's web fame. You can read about that species at this website: https://bugguide.net/node/view/69874
Your spider looks like a giant house spider or possibly a hobo spider. It would take a closer look at the underside to be sure about the species identification. Hobo spiders have an undeserved reputation as being extremely dangerous. While I wouldn't encourage you to get bitten by any spider, hobos, like almost all spiders, do not have a venom that is particularly lethal to humans.
Here is some more information on hobo spiders http://ipm.ucanr.edu/PMG/PESTNOTES/pn7488.html
and their identification http://pep.wsu.edu/wp-content/uploads/sites/7/2015/05/PLS116_1.pdf
If you still have the spider, you can take it your extension office for help with the species identification.
33630 McFarland Road
Tangent, OR 97389