No, they are NOT naturally found in Oregon. However, the hobo spider does occur in Oregon and the Northwest states. It is commonly mistaken for brown recluse, and can cause the same effects (skin lesions).
http://brownreclusespider.com/faq.htm http://www.oregon.gov/ODA/PLANT/IPPM/spider.shtml
All Spiders are venomous to a degree, but the western black widow is the only dangerous one to humans there.
++In Oregon the two most common venomous spiders are Black Widow spiders AND Hobo spiders. Most people mistake the Hobo spider for the Brown Recluse. The Hobo has distinct chevron-shaped markings on the upper side of the abdomen, whereas the brown recluse has the distinct "fiddle" on its back. Hobo spiders also have two large palps that look like large fangs (esp. the males), though these are genitalia on the males. I suggest a Google search of images to see pics of all these spiders.
ATTENTION: THE FIRST ANSWER TO THIS QUESTION IS INCREDIBLY INACCURATE. WHILE THERE ARE BLACK WIDOWS (PRIMARILY IN SOUTHERN OREGON) THERE IS THE HOBO SPIDER AS MENTIONED IN THE SECOND, WAY MORE ACCURATE ANSWER. LOOK UP THE HOBO SPIDER (AKA AGGRESSIVE HOUSE SPIDER) LOOK AT PICS ONLINE FOR PROPER IDENTIFICATION.
I think so. Some say NO, they look like blackwidows but no hourglass under there body.
All spiders, technically, are poisonous, but I do not believe barn spiders are dangerously poisonous.
yes, there are poisonous spiders everywhere.
all spiders are venomous
no
no they am not
No
If a spider bites you and you get sick it is poisonous.
yes all black and yellow spiders in the U.S or Canada is highley poisonous
yes but not tarantulas and other poisonous spiders
They are not poisonous. Merely highly attractive and distracting.
yes you can
no