Room 83W is an original Chacoan room located in the back tier of rooms along Salmon's north wall. It measures 5.8 x 2.2 m and was built during the earliest occupation at Salmon, about 1090. Twelve strata were identified in 83W, including post-occupational fill at the top, San Juan era strata following, and mixed Chacoan and San Juan era layers. The lowest (Chacoan) layers included a floor and a wall foundation. A total of 19 features was associated with Room 83W, most linked to the Chacoan occupation. These features consisted of vigas, the south wall doorway and intel, vent windows in the north wall, and a pit of unknown function.