Originally Posted by kevdog
Most ACL re-injuries occur in the first 3 months after surgery, so take it real easy, you wouldn't want to go through it twice in 3 months. That's also why they want you in the knee brace the first couple of months.
A few years back I had an ACL and meniscus rebuild in June after the runoff. I remember that I hit Shoshone with a brace on around 4-6 weeks afterwards, which was cool because nothing else was running and the water was pretty tame.
As long as you don't swim or really overdo it in the boat, your biggest danger is the put-in and take-out. I would definitely stay well within your boating ability/comfort zone.
Others' sentiments about your physical condition are spot-on, too. I'm built like Rowdy Ronnie Piper, so I didn't sweat it. You might not be so lucky...