Any #electricians know what guage this wire is? It is run to the outside of the house and I'm wondering if it can go on a 30amp breaker. Don't worry, I won't take any comments as advice. 
Discussion
It looks 10-ish. If it is 10g, you can do 30A on it, but, for any significant length 8g us much safer.
Thank you Sir. Upon more digging I'm thinking 6awg. Any thoughts? 
It depends on the reference method,is it clipped direct, depth of burial, is it in contact with thermal insulation etc, what is it your trying to do?
Check markings on the outside of the cable
I tried. No marking on the visible area of the wire.
Three wire twisted seven strand at 5/8” +/- # 12ish I would think.
What AWG # on the sheath?