1925 Map of Pearsall 1-c

About this map

The Frio River snakes through the center of this 1925 survey, defining a landscape dominated by river drainage systems in Southern Texas. The confluence of several significant water bodies, including the Leona River and Palo Blanco Creek, creates a complex hydrological network that shaped early land use in the area. This sheet is an advance copy produced by the U.S. Geological Survey and the Texas Board of Water Engineers, utilizing aerial photography from the Army Air Service to capture the precise meandering of Buck Creek and Todos Santos Creek. Near the southeastern corner, the settlement of Derby serves as a primary hub of activity, situated along the International and Great Northern Jeff Davis Highway. The map provides a look at the region's topography before modern development, recording numerous benchmark elevations like BM 620 and BM 518 that anchored early 20th-century surveying efforts.