Directions

For GPS users please use 1 Millstone Hill Rd Westford as your address or the following GPS Coordinates: 42.623220, -71.488210

From the

South - From Boston, take I-93 north to I-95 south (Route 128). Follow I-95 for about 5.5 miles and exit onto Route 3 north. Continue north on Route 3 for approx. 15 miles until you reach Exit 33 for Route 40 (Groton Rd.). Take a right at the end of the ramp and head west on Route 40. Continue with "Common" directions.
North - Take Route 3 south to exit 33, Route 40. Take a left at the end of the ramp and head west on Route 40. Continue with "Common" directions.
East/West - Take I-495 to Route 3. Those two highways intersect in Chelmsford, MA. Follow Route 3 north to exit 33 (<5 mi.), Route 40 (Groton Rd.). Take a right at the end of the ramp and head west on Route 40. Continue with "Common" directions.
Common to all above - Take Route 40 west for 5 miles until you see signs for NEROC Haystack Observatory and MIT Lincoln Laboratory on the right hand side of the road. ("Entering Groton" sign is on your left shortly before the access road.) Follow the access road 1½ miles to the Haystack Observatory (BLDG. #8).

Alternate map detailing the backroads of Westford.