Room 61A is an interstitial support room located south-southwest of Salmon's Tower Kiva (Room 64W). It is a triangular-shaped room and measures 3.6 east-west by 2.1 m north-south. Five strata were identified in 61A: two post-occupational fill layers and three Chacoan artificial fill strata. Twenty features were identified -- all were vigas or other construction beams to support the Tower Kiva. Room 61A was used as a support space for the Tower Kiva complex and held up one of the latter's buttresses. Tree ring dates indicate construction during the initial Chacoan era, around 1090.