I climbed Mount Abraham on 6/25/2016 and the two formerly washed-out bridges over Rapid Stream have now been replaced, so you can drive right to the trailhead once again. It seems this happened sometime last year. The new bridges are in excellent condition and any vehicle can navigate them.
Thanks for the reminder to update this! I was there in December and the bridges were replaced then. I just forgot to change the text back. Should be good to go now. Thanks again.