Poseidon Reservoir

The Poseidon Reservoir is a location in the Commonwealth in Fallout 4.

Layout
Poseidon Energy Reservoir not only distributed water to the surrounding farmlands and towns, but it was also a source of hydroelectric power. The power generated was used by Poseidon for its research facilities scattered about the Commonwealth. Currently, the reservoir is in a state of disrepair. The hydroelectric generators no longer operate and the water has become stagnant.

The roof gantries are easy to access, and the ferals up here can be wiped out while you gaze south at Natick and Lake Cochituate. Inside, the terminal in the first metal office pod opens the security doors leading deeper into the facility. The Poseidon Reservoir Safe Key is on top of the metal pod, near a locked toolbox (Expert). Also check the broken pipe on the south wall of the main building; it leads to a Railroad dead drop with some loot and a robot model kit.

Notable loot

 * Armaments and Ammo
 * Armaments and Ammo: Trunk
 * Collectible: robot model kit (parts)
 * Health or Chems

Appearances
The Poseidon Reservoir only appears in Fallout 4.