The footbridge is an elevated pedestrian bridge spanning Storrow Drive near the Charles River. It is occupied by a single super mutant armed with a missile launcher. An ammo box and a sleeping bag are found on the bridge.
The Esplanade footbridge only appears in Fallout 4.
- Fallout 4 Vault Dweller's Survival Guide p. 449: "10.01 FOOTBRIDGE (ESPLANADE)"
"Enabling access across the main road to the river, this is now a small Super Mutant camp. Feel free to butcher the inhabitant."