Yeah I have done probably 20 trips down the lower salmon from hammer creek to heller bar. The trip is a great alternative if you don't snag a permit. It has great splashy rapids and never gets to low. However it is becoming increasingly popular and there has been many issues with groups not following proper wilderness camping techniques that may soon lead the BLM to move this river to the lottery. The run is something like 84 miles, four canyons, and wonderful large beach camps. The rapids are all straight forward for the most part class 3. There are two that are considered class 4 Snowhole and China, however I would rate them as 3+, if you know where to be they are very easy. You actually exit on the snake river, the confluence with the salmon is awesome. However after that the next 20 miles provides little flow and most who are in the know choose to bring a motor for this part of the float out to Heller Bar in Washington. To park at Hellar bar you now need a state of washington discover pass 30$ which can be purchased in Asotin on the way to the takeout when running your shuttle. I normally run my own shuttle as it is one of the easier shuttles at about 5 hours and on good roads. On a side note this river has one rapid THE SLIDE that gets massive and becomes class 5/6 at high flows, which you won't have in mid july but its good to keep in mind.