For 100 years before the dams were built on the Columbia-Snake river system, steamboats carried cargo and people to the farthest reaches of the rivers. Where water flowed, sturdy steamboats and bold captains went-with no dams, locks, or artificial navigation aids needed. William Polk Gray piloted steamboats on wilderness rivers from southwestern Idaho to northern Alaska. Gray was one of fifty or so captains who became as famous as sports stars are today. Their names and feats were known to travelers and river dwellers, just as the distinctive tone of each boat's whistle was recognized by hero-worshiping boys who dreamed of growing up to be river captains. Bill Gulick, dean of Northwest history writers, tells the story of this colorful period in the region's history.