We ran it last weekend. I would say the flow we ran it at was the minimal reasonable level. We guessed about 150 CFS but as there is no gauge to check this against it is meaningless. The best "gauge" is at the bridge before the putin. Looking off the up stream side the water was up to the grass on the bank right before the bridge. The bank if almost vertical there so a pretty decent marker. If it is below that level I would drive over to the Narrows.
The run was great, a lot of boat abuse and pin potential, and a long flat water paddle out and mile long hike in, but overall well worth the effort. The water is very shallow but slow enough to make the moves more fun than hard.
Mostly read and run technical class 4, I would recommend scouting the next major rapid after the 10' drop, rquires a strong right to left move with a trianglar pin rock adding consequence to not making it. The 10' drop sorta snuck up on us, the river takes a hard left and disappears behind some large boulders, there is a great easy to catch large eaddy on the right right as the river turns left. There is a serious siv (water goes under a bunch of boulders) between the line and the eddy so be heads up.