During today's open water swim, I was able to help a couple who got separated and the wife was heading to the midde of the river right towards where the current picks up before the rapids. The river is 4-6 km wide before the narrowing to the rapids. In most of that wide "lake" it has not current. Its like a natural man made dam:
The line in green is the good place to swim inside. There are no boats there and no current. You can touch the bottom literally 50 m to the right of the green line. To the left of the green line it gets iffy with boat traffic if you go at the wrong time of day although from the point to where it says "Google" its quite fine to swim in. But once you go past the green line towards the Ontario-Quebec border, you can suddenly get sucked into a MASSIVE current. There is no chance to swim out of that when you are in.
So I am swimming along inside the green line and I hear a person. I looked to my left and it was really hard to see with the run setting and major chop, but there was a guy yelling. So I swam over. His wife was way north of the green line heading towards the virtual provincial border. He was hysterical that she was heading directly for the current and I was able to see her and realized she had a ways to go, and she looked "slow enough" that I would be able to catch her and turn her around in time. So I bolted at full speed to get her before she got anywhere close to the current and the rapids.
In any case, it all worked out well. I turned her around and she was re united with her husband. I then went on to finish my 70 min ~3000m swim. I spent the last 30 minutes doing "fly - back repeats"...20 strokes fly, 60 strokes back.
In any case, on the map below, the green route is 800m one way, the yellow route is 400m one way and the blue route is 200m and on the blue route there is a rock outcrop at 100m so I have a good set up for all kinds of intervals:
Below is a view from the departure point where it says "Ottawa City rafting". You can see how wide it is and how it looks like a large lake...which it is until you get in the wrong spot and its a raging river