Approximate - nearest available gauge. Use as general reference only.
The Garden is a straightforward read a run section that at low water provides many opportunites to get stuck in shallow spots. As you enter this section, you can pick any line that looks deep enough but you want to end up river right to catch the main tongue that pushes from river right to river center.
Scouting option on river left when entering the boulder garden section, it's notable for the amount of exposed rocks you'll see in comparison to the rest of the river.