It is a shack on top of a hill next to the Potomac, which is infested with mirelurks. The shack is inhabited by a scavenger and his dog. In the camp are the scavenger's bed, two tables, and a doorless fridge containing two ammunition boxes.
The scavenger will often run away from the camp because of the nearby mirelurks. Therefore, they may be found dead nearby or be swimming in the river in order to flee.
The scavenger shack appears only in Fallout 3.