LOMA ALTA. Loma Alta, known earlier as Lomo Alto, is one of a group of hills in southern McMullen County (at 28°05' N, 98°33' W). It reaches an elevation of 608 feet. In 1689 the site was visited by Father Damian Massanet, who called the elevations Sierra Sacatsol. The surrounding low rolling hills and prairies are surfaced by clay and sandy loam that supports grasses and some mesquite.