Canyon Creek - Washington: Seal-Launch above Fly Creek to Lake Merwin is a 11 mile trail located near Amboy, WA. The trail is primarily used for hiking and whitewater kayaking. 11.0 miles 900 feet hiking whitewater kayaking Expand Map Sign up now to see this map! Reviews (0)Photos (0)Recordings (1)No one has reviewed this trail yet. Be the first!