YEGUA KNOBBS. Yegua Knobbs (Yegua Knobs) is a small line of hills 1½ miles south of Knobbs Springs in northwestern Lee and northeastern Bastrop counties (at 30°20' N, 97°12' W). At an average elevation of 750 feet above sea level, the hills rise 250 feet above Knobbs Springs. The surrounding rolling prairie is surfaced by clay loam that supports mesquite and grasses.