- The Klickitat River is the longest undammed river in the state of Washington, but that doesn’t mean it hasn’t been noticeably altered by the hand of man. A logging railroad was built along the west bank of the river at the beginning of the 20th century; in the 1950s, a lumber company converted the tracks into a two-lane paved private haul road. The southern section of the haul road ran right next to Highway 142, but the northern sections ran up the remote Klickitat Canyon…