I've hiked along Indian Pass Brook in the 24 hours after a big rain (2 inches), headed towards Marshall. Hell, we found all the little brooks coming off the McIntyre range that feed into Indian Pass Brook WERE BARELY passable at that time. Indian Pass Brook, forget it, in kayaking parlance it was class 5 rapids.
All the northern tributaries of a substantial 5000' foot range drain into it, it can rise pretty quick. I'm told it falls almost as quickly, so provided the rain abates within a few hours and there is a good 36-40 hours without rain, it might lower enough to get over.
Have alternative plans ready though. It only takes 30-40 minutes to get there (from the LOJ), so if you check it out and it's still too high, you can still find an alternate destination.