2019 Map of Keystone Ranch

About this map

Keystone Ranch anchors this portion of Frio County, where a complex network of intermittent drainages defines the South Texas brush country landscape. The watershed is dominated by the winding course of San Miguel Cr, which is fed by numerous tributaries including Black Cr, Cat Cr, and Hackberry Cr. These seasonal waterways are central to the region's ranching operations, providing vital drainage and catchment points like Howard Lake. Toward the southeast, the terrain shifts near the Marshall Hills, overlooking the convergence of Live Oak Cr and Mule Cr. The map details a transition from the structured grid of county roads like Co RD 3300 and E Goldfinch RD to the more specialized private routes and farm-to-market roads, such as FM 1582, that service the area's dispersed homesteads and agricultural tracts.