Moyie

This is an amazing river and one of my personal favorites. Pretty continuous, class 2-3 whitewater that keeps all boaters on their toes through the entire ride.
I'd use USGS's CFS ratings to determine run-ability instead of the feet gauge. Anything above 5,000 CFS is pretty high for this river and boaters should use caution going through the Dam and Hole in the Wall as logs have historically become wedged in these narrow canyons.
Between 3-5,000 CFS is my personal favorite levels. Most rocks are covered, waves get big and it's a fun ride. Careful at the dam, the lateral and boil lines can flip a 14 foot boat.
More rocks and holes start to come out below 3,000 CFS but Eileen Dam becomes more manageable.
1,000 CFS and below is really bony.
Avoid swimmers above and immediately below Eileen Dam at all times. The river flows underneath it and there are strong under-currents.