Directions
Note: The entrance to Armory Square is on Federal Street. Armory Square is shared by Springfield Armory NHS and Springfield Technical Community College (STCC)
From Interstate 91
Heading North
Take EXIT 5A from I-91 Northbound, go to the 2nd traffic light and turn right onto State Street
Drive east ~.75 miles to the 5th traffic light (look for the long black cast-iron fence of the Armory on your left.)
Turn left onto Federal Street, drive about 100 yards, and enter through the Main Gate to your left into Armory Square.
Turn left inside the gate and follow the signs to the Park at the opposite end of Armory Square
Heading South
Take Exit 5B/Hall of Fame Ave from I-91 Southbound, go to the 2nd traffic light and turn left under the highway [Rt.91] onto State Street.
Drive east ~.8 miles to the 6th traffic light (look for the long black cast-iron fence of the Armory on your left.)
Turn left onto Federal Street, drive about 100 yards, and enter through the Main Gate to your left into Armory Square.
Turn left inside the gate and follow the signs to the Park at the opposite end of Armory Square
From I-90 Mass Turnpike
Take Exit 45 and follow directions from Points North (above)
Take the exit going to 91 and not the one heading to 291 as this route is more direct.

https://www.nps.gov/spar/planyourvisit/directions.htm