Wildlife Management Plan for Callahan County, Texas

Callahan County's 899 square miles contain 17,714 documented oil and gas wells alongside mesquite-grassland mosaics and eroded canyons, creating a landscape where industrial infrastructure and ecological management coexist at close range. The region receives 20 to 30 inches of rainfall annually, enough to support productive rangeland but not enough to forgive overgrazing. The intersection of 4 ecoregions creates a convergence zone where species from multiple regions overlap. This ecological complexity means no single management template applies countywide.

Brush management on the Rolling Plains is a balancing act between reducing mesquite canopy cover to restore grass production and retaining enough woody structure to provide wildlife cover. The standard approach combines aerial herbicide application on dense mesquite flats with mechanical treatment of regrowth, followed by prescribed fire to maintain the treated areas. Strip-pattern treatment, alternating cleared and untreated bands, creates the habitat mosaic that bobwhite quail populations require: open grassland for foraging and nesting within short flight distance of woody escape cover. Prickly pear management is increasingly important as cactus density has increased under decades of overgrazing and fire suppression. Half-cutting or targeted herbicide application reduces prickly pear while maintaining some plants for the moisture and fruit they provide to wildlife during drought.