The trail west followed the Platte River through Wyoming. The river provided water for use but the current was very strong and it made the crossings dangerous. The cliffs along the river are made from soft sandstone and many of the pioneers scratched their names into the cliffs. There is quite a "guest book" carved into the soft stone. The etched names are preserved behind a fence and away from visitors (like me).
Life was hard on the trail and not everyone that started the journey was able to finish the journey.