You need 2 guys in the boat, one facing one way to watch for whatever washing downstream (not to mention tug and tows of all types) and the other to watch the tips of the rods/haul the anchor.
Did you know you should have twice the length of your boat in chain on your anchor rope to make sure your anchor lays down and catches bottom without dragging too much?
How are you going to haul chain over the pontoon? :hmmm:
Well it can be done but is something of a PITA.
Good advice on the instant release knot attach the whole kit and caboodle to a 16" Scotchman so you can cast off and chase large fish then return to your exact spot upstream of that certain hole.
One more thing, some people make the mistake of anchoring in fast water over deep deep holes, Yes there are fish there on the bottom there are many many better places to fish on the Fraser, shallower easier to anchor places by the dozen that have as many if not more fish.