I well remember copperheads from the 4 years we lived in Pennsylvania. They seemed to make a habit of living under porches. However, out here in the Pacific NW we have only rattlesnakes to worry about, and only east of the Cascades crest. At least rattlesnakes tell us when we're trespassing on their environment!
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey