Phone: 207-469-6553

740 Fort Knox Road, Prospect, Maine 04981


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Copyright 2018 - Fort Knox and the Penobscot Narrows Bridge

Fort Knox and the Penobscot Narrows Observatory are CLOSED for the Season!


The Fort Historic site grounds remain open 9am to 5pm daily.  We expect to open the Fort interior and the Observatory to the public on May 1st although the Covid-19 epidemic precautions may change plans.  We encourage visitors to get out, get some exercise (walk the dogs on a leash) and enjoy a visit to Fort Knox safely. Please do not visit if feeling ill, wash hands and practice social distancing. The Friends of Fort Knox wish wellness to you and your families as we get through these hard times.  

Call 207-469-6553 or email for information!

The Fort Knox Historic Site features one of the best-preserved examples of coastal defense fortifications constructed in the mid-1800s.  It is America's first fort named after Major General Henry Knox. 

During the season (May 1st to October 31st: The Fort and Observatory are open from 9am to 6pm (7pm in July/August) unless otherwise posted at the gate. The grounds are open from 9am to sunset  Free interpretive guided tours provided by volunteers are available from 11am to 3pm.  Reservations for special events (weddings, family gatherings, reunions, business retreats) and group tours may be arranged by calling 207-469-6553 or


During the off season (November 1st to April 30th) Grounds are open from 9am to 4pm - weather dependent.

 The Penobscot Narrows Observatory is the tallest bridge observatory open to the public in the world.  Visitors to the observatory ride Maine's fastest elevator up 420' feet for breathtaking 360 degree views of the Penobscot Bay area.

Please enjoy the slideshow below for a taste of what Fort Knox and the PNO have to offer!