This is a Child Item for the Parent data release, Mapping Riparian Vegetation Response to Climate Change on the San Carlos Apache Reservation and Upper Gila River Watershed to Inform Restoration Priorities: 1935 to Present - Database of Riparian Floodplain Boundaries for the San Carlos and Gila Rivers. This Child Item is the shapefile showing the 1935 riparian floodplain and active flow channel for the Gila River and San Carlos River within the San Carlos Apache Reservation. The product was developed by digitizing the active channel and primary riparian floodplain using historic 1935 aerial imagery (Arizona State University GeoData, 2021). This data was used in the development of the following data release: Petrakis, R.E., Norman, L.M., Middleton, B.R., 2023, Mapping Riparian Vegetation Response to Climate Change on the San Carlos Apache Reservation and Upper Gila River Watershed to Inform Restoration Priorities: 1935 to Present - Database of Trends in Vegetation Properties and Climate Adaptation Variables: U.S. Geological Survey data release, https://doi.org/10.5066/P9HL0N5T. And in support of the following publication: Petrakis, R.E., Norman, L.M., Middleton, B.R., 2023. Riparian Vegetation Response amid Variable Climate Conditions across the Upper Gila River Watershed: Informing Tribal Restoration Priorities. Frontiers in Environmental Science. https://doi.org/10.3389/fenvs.2023.1179328.