1979 Map of San Ygnacio

About this map

Falcon Reservoir dominates this international borderlands survey, defining the late 1970s landscape of Zapata County and Tamaulipas. The reservoir's waters submerge portions of the Rio Grande valley, indicated by the normal pool elevation and several navigational markers like Buoy 36. The town of San Ygnacio serves as the primary settlement on the Texas side, flanked by local landmarks such as Cementerio del Pueblo and a local Landing Strip. The map captures a transition in local habitation, noting both the established New Ramiro and the site of Santa Cruz (Abandonado), likely displaced by the rising waters of the reservoir project. Rural life is evidenced by numerous named ranchos and smaller localities, including Rancho Grande and El Chaparral, which are connected by a network of unimproved roads and light-duty paths through the mesquite-laden terrain of the Rio Grande basin.