Room 81W is an original Chacoan room located in the central section of Salmon Pueblo, just east of the Tower Kiva (Room 64W) and measures 5.3 x 2.5 m. Sixteen strata were identified in 81W. Below two post-occupational layers were structured trash and roof-fall strata of San Juan age; next were structured trash and roof-fall of mixed San Juan and Chacoan affiliation. The lowest units were Chacoan in age, including a floor with very few associated remains. Twelve features were associated with 81W, including latillas and sockets of either Chacoan or San Juan origin and Chacoan doorways. One of the features contained posts forming some sort of rack feature with many unique lithic artifacts. Room 81W was built during the initial construction period, around 1090 and used by people during both periods until the 1280s.