Room 61B is an interstitial support room located south-southwest of Salmon's Tower Kiva (Room 64W) and is located in the central sector of Salmon Pueblo. It is a triangular room measuring 2.1 m east-west by 5.7 m north-south. Five Chacoan period strata were identified. Fifteen features were associated with Room 61B, most were support beams relating to the room's primary support function. Room 61B was used as a support space for the Tower kiva complex and held up one of the buttresses supporting the kiva.