You might consider going with someone once or twice up that way in a shallower draft boat, and watch their depth finder to get familiar with the area.
When the river calms down some, I think the place you'd have the biggest concern with would be during the run up along side the locks where you make the slight left and start up the slew. Most of the way up the slew should be no problem, but just as you get to where you are going to turn a slight right toward the dam, there is a rift and current break that tends to be quite shallow. On this video, scroll to the 4:45 to 5:15 part of the film, and you'll see the rift I'm talking about. Hybrid Fishing Below McAlpine Dam - YouTube
Pics below are map showing about where rift is, then a pic running the slew just at the rift, then looking back toward the side of the locks, and what the water looks like running thru. This was a December trip when the dam looked like the last pic.
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