It's a decent trail to escape to escape the Arizona heat. Even in the middle of July still a cool ride through the shade of the Flagstaff Pine trees. It does a great job of linking up to the NAU trail which is worth a look (interesting buildings architecturally), the Arizona Trail and the Route 66 trail but doesn't really link to Mars Hill trail very nicely, a roughly one mile elbow ticker of a ride down the skinny shoulder of RT 66 involved in the effort.

Dirt trail but suitable for recumbent trike.

Fort Tuthill Trail rates one star for Tri-Cycles.
Started this Trail uphill from the North end, parking in the Shopping Center. After crossing University Drive the trail has some steep grades where one couple turned around rather than come back up the hill. I was able to slowly get down the hill, on my tri-cruiser, with out sliding off the trail, I would not do it again. The gravel is loose. Two more slopes as you go south. After crossing Nf- 532 the trail is back on the RR Grade to its end at N35.14300 W111.69191, with Parking.
On returning A lady rider stopped and pushed me up one Hill that the rear wheel could not get enough traction. Then she showed me the overgrown RR Grade that avoided the remaining two Hills, Thank You! The Trail Map on traillink does not follow 0.36 mile of the RR Grade. I still had a problem getting my Trike over the Boulders at the exit. A busy trail this Monday 9-11:30 am. Noel Keller 1 Sep 09