While I was digging for the above link, I found this from 2002 pertaining to Bighorn.
One quote I found quite telling is as attached. I can't copy and paste the text for some reason....
https://open.alberta.ca/dataset/695c...02-2002-05.pdf
There are a whole host of articles on the Bighorn that can be found here....
https://open.alberta.ca/publications..._modified+desc