For the location as it appeared prior to Steel Dawn, see ATLAS Observatory.

Gametitle-FO76 Steel Dawn.png
Gametitle-FO76 Steel Dawn.png
Formerly the ATLAS Observatory, Fort Atlas now serves as the headquarters of the new Brotherhood of Steel in Appalachia.Fallout 76 loading screens

Fort Atlas is a location in the Savage Divide region of Appalachia, formerly known known as ATLAS Observatory.[1] Once the site of an advanced military science project, the observatory lay dormant for years following the Great War, inhabited by hostile robots. In 2103, Russell Dorsey collaborated with the Vault Dwellers of Vault 76 to construct a base for the incoming Brotherhood First Expeditionary Force, using the observatory as their construction site. Upon arrival, the Brotherhood renamed the facility to Fort Atlas, converting it into its current appearance.



Main article: ATLAS Observatory

While appearing to simply be an astronomical research laboratory, ATLAS was a military project on weather modification. Scientists worked here to advance the ATLAS Program, or Atmospheric Terraforming Laser Accelerator System before the Great War.


In 2103, Lucky Lou scavenged several automated turrets from the observatory for use in attempting to commit suicide and avoid turning feral.[2] Later that year, Russell Dorsey established a campsite near the facility's entrance and, with the assistance of his utility Protectrons, began constructing a framework around the structure. This included various elevated platforms, a medical tent, a landing pad, and deliberately sealing the observatory's interior.[3]

By late 2103, he had garnered the assistance of the Vault Dwellers in helping him fortify and establishing the new headquarters for the Brotherhood First Expeditionary Force.[4] Upon arrival, the Brotherhood fully occupied the base and renamed it to Fort Atlas.[5]



The observatory caps the crest of a hill along Route 63 east of Monongah. There are three entrances to the building. The exterior of the building has been re-inhabited by Russell Dorsey and several Brotherhood initiates and hopefuls.

Various platforms now provide easy access to higher parts of the structure. Near the eastern entrance, an armor workbench, weapons workbench, and power armor station can be found alongside a stash box. A small medical tent lies above the southern entrance, and a small residential tent has been assembled to the south.


The building is a multi-level structure, with border rooms encircling a vaulted central room, that houses the telescope, which extends vertically for all of the levels. The ground level floor provides the main entrance to the structure, with an office on the right and a dining / recreation area downstairs. A glowing laser barrier initially prevents entrance to the remainder of the building until the player character applies for entry into the Brotherhood ranks.

The large central room has a workshop and armories in a eastern border room. This room contains two armories behind heavy metal mesh cages each with a power armor suit and weapons. However, they are not accessible. The room includes weapon, tinker, chemistry, and armor workstations as well as a stash box. A barracks with a shower facility is located in the western border room. There are two stairs in the central room at the laser barrier leading to an upstairs area with Paladin Rahmani on one side and Scribe Valdez on the other.

A door off the Paladin's area opens onto the top of a stairwell. Going down to the bottom leads to a kitchen and bathrooms where there are two orphans, Maximo and Marcia Leone. The middle of the stairwell opens into the workshop and armory room off the main floor. To the east in the central room is a door leading down to the substructure.

ATLAS substructure

The substructure is a basement with three levels, internally accessible via a flight of stairs. The top level appears to be the same level as the main floor of the overall building, but that top level is accessible only by going upstairs inside the sub-structure. The lowest level is the first reached via the story line, but the player character will explore further to meet early quest objectives. The lowest and middle levels have solid floors while the top level is a catwalk and doors around an open area surrounding the telescope.

There are a total of three workbenches on the middle level of the basement, two for weapons and one for armor.

Notable loot

Main interior

ATLAS substructure

  • ATLAS decommission reports - Notes, found throughout the bottom level of the substructure.
    • The first is found on a console near the ATLAS diagnostics terminal.
    • The second is found on a wooden cart near the skeleton of Isaac Hammond.
    • The third is found on a metal cart along some piping, to the right after going down the stairs from the main entrance of the substructure.
  • Potential magazine - In the mine section during The Best Defense, on a shelf near the top part of a conveyor belt in the medium-sized room with the catwalk and office niche.
  • Two potential recipes:
    • One in the mine section, near the wall-mounted terminal and connected supply room, on a cabinet at a nearby dead end.
    • One on a shelf near the westernmost tunnel girder, in the final room of the mine section.
  • CPU - Quest item, obtained from the ATLAS data center terminal during Mother of Invention. May be in good condition, damaged, or destroyed, depending on quest choices.
  • Induction coil - Quest item, obtained from the top of the central machine during Mother of Invention. May be in good condition, damaged, or destroyed, depending on quest choices.
  • Ion focus - Quest item, obtained from the base of the central machine during Mother of Invention. May be in good condition, damaged, or destroyed, depending on quest choices.
  • Mysterious component - Quest item, obtained from the top of the central machine after acquiring the induction coil during Mother of Invention. Always in good condition.
  • Pressure gauge - Quest item, obtained from a yellow machine in a side room of the upper chambers during Mother of Invention. May be in good condition, damaged, or destroyed, depending on quest choices.


  • The location of ATLAS Observatory was renamed to Fort Atlas in patch 24, the initial release of Steel Dawn.
  • If one chooses to call a nuclear strike on the location as part of the quest I Am Become Death, individuals outside of the location will don hazmat suits. Upon detonation, everyone around the exterior of the station will die except for Russell Dorsey. Weaponry outside will also be damaged and require repair.


Fort Atlas appears only in Fallout 76. Formerly known as ATLAS Observatory, it was expanded upon in The Legendary Run update, before being fully converted to Fort Atlas with Steel Dawn.




ATLAS substructure

Mine section


  1. Fallout 76 Vault Dweller's Survival Guide p.409 "22. OBSERVATORYIn-game spelling
    The AtlasIn-game spelling Observatory, an atmospheric and astronomic facility, is one of the largest domed telescopes still left standing. It offers loot as well as information on what scientific research was going on before the bombs dropped. Outside, the rocky mountain outcrop upon which the observatory is built offers exceptional views to the west, toward Monongah. There's a small exterior door (2) on the structure's western edge, but the main entrance is on the south side, after navigating an enemy-filled parking lot (or sneaking in via the lower loading dock entrance to the southeast). Inside, the circular structure is somewhat confusing unless you methodically search each chamber, culminating with a check of the giant telescope itself."

    (Fallout 76 Vault Dweller's Survival Guide Atlas of Appalachia)
  2. Carleton Mine terminal entries; Lou's engineering log, Turrets
  3. Back in a bit
  4. Events of Fortifying ATLAS
  5. Vault Dweller: "Fort Atlas?"
    Russell Dorsey: "Yep. The Brotherhood renamed it when they turned it into their new headquarters here."
    (Russell Dorsey's dialogue)
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