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The Inner Basin Loop is a short run from the Lockett Meadow Campground north of Flagstaff.
It showcases the area's volcanic origins and "cataclysmic heritage," the USFS notes, and signs of ancient lava flow are evident throughout the basin.
Just over 3.5-miles, the circuit tours a shadowy forest and a unique ecosystem dominated by pine and aspen, the latter known for turning a brilliant gold color in the fall. Along this run, one could expect to see wildlife ranging from porcupine to elk, plus the occasional black bear.
According to the USFS, "black bears have been known to stroll right through groups of picnickers without so much as a glance at their lunches," though carrying bear spray in the backcountry is still good practice.
Stands of aspen and hillsides covered in wildflowers only accentuate this beautiful loop.
Cross-country skiers can also enjoy this area as late as June, so plan your visit accordingly with the weather. This Inner Basin Loop begins at the [Lockett Meadow Campground](https://www.fs.usda.gov/recarea/coconino/recreation/camping-cabins/recarea/?recid=55136&actid=29), a primitive campground with spectacular views of the San Francisco Peaks.
It is generally open between the spring and October and requires a day-use fee to park.
Sites are available on a first-come, first-served basis for a fee of just $18 per night.
Unlike other more developed areas, there are no electric hookups, no drinking water, and only vault toilets to service the campground.
For those looking for a longer trail run, the Inner Basin Trail (#29) continues beyond this loop until it reaches the Weatherford Trail (#102).
From there, you could summit Humphreys Peak, or plan a longer circuit or shuttled run with some creative planning. Sources: https://www.fs.usda.gov/recarea/coconino/recarea/?recid=55110