Skip Maine state header navigation

Agencies | Online Services | Help

Skip First Level Navigation | Skip All Navigation

Home >Planning Your Trip

Planning Your Trip

This is an aerial view of the bridge


The Penobscot Narrows Bridge and Observatory is conveniently located in the heart of midcoast Maine. The bridge spans the Penobscot River, linking the towns of Prospect with Verona just south and a bit downriver from the town of Bucksport.

The observatory is easy to get to, with the entrance just off of Route 1 in Prospect on Route 174. All visitors must enter through the Fort Knox State Historic Site, located at 711 Fort Knox Road in Prospect.

The observatory is closer than you think to several Maine towns and cities, making it an ideal day trip. Please see below for approximate mileage.

Approximate mileage to the observatory

  • Augusta – 58 miles
  • Bangor – 28 miles
  • Belfast – 18 miles
  • Bucksport – 2 miles
  • Camden – 36 miles
  • Ellsworth 25 miles
  • Portland – 118 miles

Wondering how to get to the Penobscot Narrows Observatory?

Our address is 711 Fort Knox Road, Prospect, Maine 04981. You can enter this address into a GPS unit, Mapquest or Google Maps.

If you are traveling from Belfast:

Proceed north on US Route 1, through Searsport and Stockton Springs, immediately before crossing the Penobscot Narrows Bridge, take a left onto Route 174. The Penobscot Narrows Observatory is accessed through the Fort Knox Historic Site which is approximately 1/4 mile up on your right.

If you are traveling from Bar Harbor:

Follow US Route 1 south across the Penobscot Narrows bridge, immediately adjacent to the town of Bucksport. Once over the bridge take a right onto Route 174. The entrance is approximately 1/4 mile up on your right.

If you are traveling from Bangor:

Follow Route 1A South through the towns of Hampden, Winterport, Frankfort and Prospect. In Prospect Center, take a left onto Route 174. Follow Route 174 approximately 4 miles. Fort Knox will be on your left. On Route 15 South....follow Route 15 South through the city of Brewer and the towns of Orrington and Bucksport. In Bucksport, take a right onto Route1 South and proceed over the Penobscot Narrows bridge. Immediately upon exiting the bridge take a right onto Route 174. Fort Knox will be approximately 1/4 mile up on your right.


This page last updated on 7/14/11