I have a PVC homemade bow in my backyard that I want to shoot. Can I shoot it at a target that is up against the fence? I will put cardboard around it, but I have neighbors on three sides of my house and a road on the 4th. I will be shooting down but I might miss. Do I need to get the neighbor's permission and if I do is it still legal?
ORS 166.220 suggests this would be illegal - specifically its "unlawful use of a weapon" if a person (emphasis mine):
Intentionally discharges a firearm, blowgun, bow and arrow, crossbow or explosive device within the city limits of any city or within residential areas within urban growth boundaries at or in the direction of any person, building, structure or vehicle within the range of the weapon without having legal authority for such discharge.
So what's "within range"? With a homemade bow of unknown construction, draw weight, and unknown arrows I'd say it's pretty much going to be something you find out when an arrow goes that far. I wouldn't expect it to match the range of high-end bows and arrows (I've seen 40lb recurves cover ~250 yards) but 100 yards plus doesn't sound ridiculous - more if it's got some elevation to it. The point is you really don't want to find out the hard way when a shot goes astray giving your neighbours the old King Harold treatment.