|The following is based on Fallout New Vegas cut content and has not been confirmed by canon sources.|
The northwest sewers and its counterpart the Southwest sewers would've have been accessed from the central sewers, but would also link to North sewers, an unknown location and some point to the outside world. Large, maze-like and mostly submerged in radioactive water and the only working door being a sewer pipe to the southwest sewers.
While never actually making it in-game, the northwest sewers has several spawners for Fiends. And unlike its counterpart, has some minor explosive loot and several dead prospectors.
- Random loot obtainable from Fiends
- Dead prospector loot
The southwest sewers were set to appear in Fallout: New Vegas but were ultimately cut.