Just a quick Google search of Alberta oh use on public land and came up with this....
It's the Law
Ride on approved trails only
Keep wheels out of streams, rivers, and lakes
Wheeled or tracked vehicles are not allowed on beds or shores of watercourses, wetlands or waterbodies
Driving in these areas produces harmful ruts and erosion problems. In addition, fine sediments stirred up by tires are harmful to fish. See:
Know B4 U Go: ATV's and Water Don't Mix
Keep Wheels Out of Water(PDF, 21 MB)
Take garbage with you - leave nothing behind
Prevent start of a wildfire - keep your machine free of debris
Limit your stay to 14 days
Be sure your OHV is compliant. The unit must:
Be registered
Be insured
Have a licence plate
Have a head-light and tail-light
Have an approved muffler.
I would check directly with authorities before I sunk a bunch of cash into this and then what......make a pontoon boat I guess.