Some MATC designated corridor monitoring sections nearly coincide with trail maintenance sections, others don't. This is why there are 70 corridor monitoring sections and 90 trail maintenance sections on the A.T. in Maine. The two are very different jobs. Maintaining the A.T. is about assessing, planning and responding to conditions right on and immediately along the trail. The scope of trail maintenance is trail focused, period.
Monitoring is tract and corridor focused.
Corridor monitors assess and respond to conditions beyond the immediate trail, all the way out to the boundary line of the corridor tract. It includes assessing activities that may be occurring just outside the corridor, or activities that may be intruding across the boundary line into the interior of the corridor. Some examples are timber trespass, offroad vehicles, dumping, and other alterations of the tract from human activity. Changes in the natural environment from insects, disease, or forest fires can also be a part of the scope of corridor monitoring. While some trail maintainers also monitor the immediate corridor, others don't.