Skagway River Branches: 1-East Fork: The East Fork branches off the Skagway River, opposite Mile Post 4.8. From there, the railroad follows the East Fork to Mile Post 5.8, where it makes a U-turn, crosses the East Fork, and loops back to follow the main river. 2-White Pass Fork: The Skagway River turns to the east, and White Pass Fork branches off to the north, opposite Mile Post 12. From there, the railroad follows the Skagway River to Mile Post 14.2, where it makes a U-turn, crosses the Skagway River, and loops back to follow White Pass Fork. 3-Cut-off Gulch: Cut-off Gulch branches to the east, and Dead Horse Gulch branches to the north, opposite Mile Post 18. From there, the railroad follows Cut-off Gulch to Mile Post 18.6, where it makes a left turn and crosses Cut-off Gulch. 4-Dead Horse Gulch: After crossing Cut-off Gulch, the railroad goes through a tunnel which comes out along Dead Horse Gulch. From there, the railroad follows Dead Horse Gulch to its head at Pump House Lake, at Mile Post 20.