One stretch of smallmouth water I fish is under a bridge that is on a road that leads out of shall we say, an area that has a little less espect for the law than others. The bridge appears to be a convenient dump for stolen goods. Stereo equipment, bikes, many other things. I usually lift stuff out, and at least carry it to the bank. Though there are a couple of bikes that were tangled in some tree branches, that I couldn't move last year. The ice must have taken them out this year. Metal doesn't bother me as much as some of the chemicals that leach out of some of the electronics, or stuff like your A/C unit.