Stopped to photograph this monument today. I've actually driven by it several times but decided to stop and take a look at it today. Very interesting story. You can read more about the history of this crossing here. It reminds me of a book I read a while back. The book was called "Women Who Pioneered Oklahoma" and it recounts several stories of what life was like before and after statehood in Oklahoma. I remember reading that the Canadian river was full of "quicksand" and it would become very hard to cross at times. It could also fill up quickly after a rain and you might get stranded on one side for days until it became passable again. Unfortunately, I wasn't able to get a good pic of the river from the turn off of the highway. Maybe have to explore another day.
Here is a link to the book: Women Who Pioneered Oklahoma