Index of NFS developed trails is one of a group of measures under the rec facilities indicator -- one or more is required. The rec facilities indicator is under the opportunities for primitive and unconfined recreation monitoring question for solitude or primitive and unconfined recreation quality.

This measure is reported as a single value for report year.

The table below shows reported developed trails trends at each USFS wilderness using this measure. As ever, selected measures have filled grey circle, and colors indicate an upward, stable, or downward reported trend. Unselected measures can also be recorded, and are shown as hollow circles in the appropriate color.