We now have copies of the early Oregon and Washington Government Land Office survey plats.
For L&C purposes we have made a subset of these to help us understand the earlier landscape.
 Go to the GLO maps.

Lewis & Clark Expedition Trail Map (dim. 34.61" x 8.61")
Download large PDF version (1.55MB)

End of the Trail, Nov. 7 to Dec. 7, 1805
Download larger map with more info: 8 x 10 (.5 Mb)
Go to the GLO maps.