I was planning to do Carthew-Alderson as a thru-hike this year, but just learned that the Akamina Parkway has been closed due to flood damage. The park official I spoke to said they don't know when it will be re-opened and that it may stay closed all season.
Anyway, I thought this info might be helpful to any Chatters planning a trip up into Waterton Park...
If someone hears that the situation has changed, please let us know!