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Neponset Park consists of two small one-room cabins next to the shore and a camper slightly to the west. The most singular feature of the area is the enemies, which include a mirelurk king, a mirelurk hunter and several common mirelurks. There are also two barnacle traps: one just outside the southern house and one just inside the camper.
The Neponset Park terminal entries also appear in the main locked cabin where the author of the entries mentions Quincy Quarries constantly working next door. If the Sole Survivor chooses to travel to the quarry, they will find that it was being built very hastily, as it was intended to bury and conceal several tons of nuclear waste, causing it to be irradiated.
- A suit of leveled power armor is located just northwest of this location. It is underwater, in a pond beneath the overpass. Look for the pond that also contains a partially submerged, rusted APC. Alternately, head directly north from the small refueling station near the road to Neponset Park.
- Last entry, a note in the possession of Charles Dieter Jr.'s corpse under the elevated highway east of Quincy Quarries. The skeleton will be near the section where the broken highway begins to bow downward, near a truck with a yellow bulldozer and trailers loaded with rock slabs. Dieter is also the writer of the log entries at Neponset Park. Other items on him are a trilby hat and the Neponset cabin key.
- Park sign in, a note inside the small trailer by the road, on top of a desk, where the barnacle trap is.
The Neponset Park only appears in Fallout 4.