We were just out this past weekend so we won't be out again for a couple of weeks.
One thing to take into consideration is the fact the water is coming up over a foot a day and the National Park Service seems to be having troubles keeping up with the underwater obstruction markers. A prime example of this is what is called Anchovy Point. Thats the point where you turn uplake about a mile up from the damn when exiting Wahweap. In antcipation of the water coming up, they have pulled the main channel marker on the East side of the channel, but there are still some rock markers there as well as some rocks that aren't marked.
Best bet is to stay to left of the greens and stay slow until you head up the main channel there. Sticking to the middle is a pretty safe bet all the way uplake. At Marker bouy 37, on the South side of the channel, there is a gravel mound that might still be out of the water, depending on the levels. Thats right at Rock Creek canyon.
Other than that,, have a great time and enjoy (gas at Dangling Rope was $5.19 over the weekend and all they have is 87. Bring Octane Boost)