I am assuming the spot you were trying to cast to , is across from you. That would be a hard one, because the faster flow was in the middle. If you did not move, you would have to cast, to the spot and then with only the leader and a bit of fllyline down on the river, pick up the rest of the flyline if possible and have that portion flow through the spot, much like float fishing trying to keep your line off the water. In my opinion that would be a hard cast to do. A better way would be to wade over to that side of the river if possible. And then make a cast to it, while you are upstream, sort of like a wiggle cast, and have the fly flow down to your target spot. The fly would then move at a uniform rate, to the fish and hopefully fool them to bite your fly.