2 feet or 1.9 feet. 900 cfs maybe, something like that. Low enough that you want to bring your A game. Lots of low water threads. I have seen people at that level just have a great time and then some who can't see three moves downstream just have their ass handed to them. At least on the first 20 miles.
It is class 3 to 3+ but several rapids turn into long complicated rock gardens that you have to keep looking and setting up for well ahead of time. Consider flying in gear if this doesn't sound appealing. I have introduced several to low water Middle Forking who like tight technical boating and they did fine.
There are good lines through almost everything at that level but if you got off line you could have a bad day.
The high volume class 3 to 4 guys who have never looked at a picket fence of rocks and thought "which is the least offensive place to get stuck here?" don't have such a good time.
Bring polarized glasses - it helps. And lots of flies the fishing should be great.
Bring a pin kit and know how to use it. If you are concerned about your abilities with a fully loaded boat in potentially ass kicking rock gardens, try to fly in as much as you can. Your honest appraisal of your skill level will be your best friend.