- Marshall Lake Trailhead to Interstate 40
- 17.9 miles
Southern Trailhead: Marshall Lake Trailhead
- GPS Coordinates: 35.11125° N, 111.54138° W
From Flagstaff, take the Lake Mary Road exit (339) off I-17 for 9 miles, then turn left (east) on FR 128 at the sign for Marshall Lake. Pass the observatory turnoff, then at 2.2 miles turn left before Marshall Lake (more of a marsh) and park at the AZT sign on the left. If you are coming from the south on Lake Mary Road, the Marshall Lake turnoff is 7.5 miles north of Pine Grove Campground.
Northern Access Point: I-40, Cosnino Road Exit
GPS Coordinates: 35.20249° N, 111.48559° W
From Flagstaff, travel east on I- 40 to the Cosnino Road exit, number 207. Turn right and then immediately turn right again onto the frontage road. Continue on the frontage road for 0.7 miles to a very small, unofficial pullout on the south side of the road. From this point, the northern terminus of Passage 31 lies 0.2 miles east, via a two-track trail, at an underpass below the railroad tracks and the freeway.
Trail Route Description
From the Marshall Lake Trailhead the trail heads mostly west across flat forest land. It passes through a gate, drops into a small canyon, crosses a road and climbs out the other side. The trail crosses FR 128B and then descends steeply into Lower Walnut Canyon. It passes the Sandy’s Canyon Trail junction, turns to the right and goes up the canyon. The trail forks to the right and climbs steeply out of Walnut Canyon at Fisher Point. Once on top it passes the Fisher Point Trail junction and then crosses FR 301. The trail parallels Walnut Canyon and passes another trail junction. After two more junctions the trail descends down into a tributary of Walnut Canyon. It follows the canyon for a short ways and then climbs steeply out of it. From here the trail joins a two-track and then heads north up to FR 303, which is a trailhead. The trail stays north of the Walnut Canyon National Monument until it crosses the entrance road. It then turns to the north and works its way down to Interstate 40.
About 6.4 miles from the south end of this passage the AZT splits. This passage and passage 32 continue in a wide arch through many gentle miles of the stunning Arizona high country around Flagstaff. Passage 33 takes users into town. Know that shopping opportunities are available on both routes, the bypass route crosses highway 89 less than two miles east of a large mall and motels, and cab fares in town are quite reasonable.
- Spring, Summer and Fall
- Current weather forecast
There are no reliable water sources on this passage. Water can sometimes be found in Walnut Canyon and there is water in the city of Flagstaff and in Walnut Canyon National Monument.
- All water along this passage should be purified prior to use.
- USGS Topographic Maps: Lower Lake Mary, Flagstaff East and Winona.
- Coconino National Forest – Visitors Guide.
- Coconino National Forest – Recreational Opportunity Guide.
- Coconino National Forest map.
- BLM Information Center maps.
For more information
- The Passage Steward
- Coconino National Forest, Peaks Ranger District, 5075 N. Hwy 89, Flagstaff, AZ 86004 (928) 526-0866.
- Walnut Canyon National Monument 6400 N. Hwy 89, Flagstaff, AZ 86004 (928) 526-3367.
- BLM Information Center (602) 417-9300.
Current Passage Info
Photos from the Arizona Trail Association’s Flickr galleries, for this specific passage. View the entire Flickr account.