Directions: From either direction from I-495 take exit 30 (2A/110) and turn toward Ayer (that's to the NW). From either direction, you will make a left turn onto Rt 2A. Follow 2A all the way to the Devens Commerce Center entrance. You will go through a rotary about 5 mi from I-495. Continue on 2A which is the second exit in the rotary (straight across, just past the McDonalds). You will then go about 1 mile and be in the center of downtown Ayer. 2A will take a right turn just past the main business district; there will be a Mobil station on your left at that corner.

For the 2010 entrance to Devens (flood detour entrance), travel just past Bishop Rd and follow 2A to the left fork (111 goes straight/right). Follow 2A for another 3/4 miles and turn left into the back entrance of Devens (about 1/4 mile past the railroad tracks), behind the air control towers. Proceed up the hill to paddock.

Approximate address: 90 Fitchburg Rd, Ayer, MA

For the usual entrance to Devens, travel about 1/2 mile. About 3/10s of a mile after Dunkin Donuts (and just past a power transfer station), take a left onto Bishop Road. After the cemetery (on left) go through the first gate. About 1/2 a mile after this gate, bear right at the 'Y', then turn right at the 4-way intersection, and proceed up the hill, through the gate. This will take you on to the site.

Approximate address: 100 MacPherson Rd, Ayer, MA

Stop at the entrance gate to sign the waiver and get a wrist band.