Well, the run for sure won't stop it. The coop might, or it could tear the siding off the coop if it wants to...
Thing is, bears are pretty odd, and it may or may not be interested in the chickens. It may VERY well be more interested in the chicken feed, and will DEFINITELY be interested in any dog or cat food it can find, as well as any trash it can get to.
Get anything it might want, including the hens, any pets, any small livestock etc, out of sight, and as locked up as you can get it, and call Animal Control, or Fish and Game, or the Sheriff or all of the above and tell them about the bear. Even though it didn't actually threaten you or your animals, I'm sure they'd like to know that it is in your neighborhood and any small children or elderly people should be warned too.