A NH senator got an "earmark" in the budget to rebuild the "loved to death" and rather beat up loop from Lafayette Place that runs up to Greenleaf Hut via Old Bridle Path and then onto the Greenleaf trail to the Summit of Lafayette south along the Franconia Ridge Trail over Mt Lincoln and then over to Haystack before leaving the AT down Falling Waters trail and back to Lafayette place. The work has just started by a large crew from many organization and led by the AMC. (Note it also includes the same route coutnerclockwise ) . I have not found a good link with details, but the general articles are that they are going to be doing major trail hardening and some relocations all along the loop. My guess is the AT portion of the work is mostly building scree walls to direct the crowds onto one path to minimize damage to the ridge. The trail is used by many folks including trail runners and between lazy hikers and trail runners, many paths of least resistance around hardened staircases have caused erosion issues and substantial widening out of the trail bed. Falling Waters down near the falls is in need of major work as the steep soils covering ledge are not well suited for the year round volume of traffic.
The crews work Monday through Thursday and at this point no closures have been announced. They are doing serious rock work in places and expect that at times, folks may have to wait while they are doing particularly hazardous work moving boulders and step stones. To paraphrase another local club known for their rockwork, "if the rock can be handled by one person it's not big enough for a step"
No schedule on how long they are working but at least part of the crew are high school and college age so that implies that staffing will decrease by the end of the summer. My guess is this is multiyear event.