Fort Lewis itself is close to 16 square miles in size.
The 'back gate"is the fort Lewis east gate which is the only way to get to yelm unless you exit by way of the main gate,getting on to Interstate5 south towards Olympia.Exit I-5 and heading east will get you to yelm.Taking the east gate will give to a option for spanaway,graham or Roy-Yelm.
I would say you can run at your hearts delight crisscrossing Fort Lewis,continuing on to the old madigan army hospital area on to Mcchord air force base where the jogging trail goes the perimeter of the airfield.
MapMyRun.com | Find Runs and Running Routes in Fort Lewis, WA
Sports & Leisure | www.nwguardian.com
Thanks to our great climate here,jogging year round should be no problem.