This Level 1 (L1) dataset includes single look complex (SLC) and interferogram products for the Atchafalaya Basin, a portion of the Mississippi River Delta (MRD) in coastal Louisiana, USA, in October 2016. The data were collected by Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR), a polarimetric L-band synthetic aperture radar flown on the NASA Gulfstream-III aircraft as part to the Pre-Delta-X campaign. A single study region, flight line 'gulfco_12011', was sampled six times at approximately 30-minute intervals to monitor changing water levels. This UAVSAR dataset contains a Single Look Complex (SLC) stack product and co-registered interferograms in the HH polarization. The SLC stack product is a standard UAVSAR product, delivered by the UAVSAR processing team.