The canyon country of southern Utah and northern Arizona a celebrated desert of rock and sand punctuated by gorges and mesas is a region hotly contested among vying and disparate interests, from industrial developers to wilderness preservation advocates. Roads are central to the conflicts raging in an area perceived as one of the last large roadless places in the continental United States. The canyon country in fact contains an extensive network of dirt trails and roads, many originally constructed under the authority of a one-sentence statute in an 1866 mining law, later known as R.S. 2477....