Lehi is a community within Mesa, Arizona. Lehi existed prior to the founding of Mesa, and was annexed by its much larger former neighbor in 1970. It is now the northern limit of central Mesa. Lehi is adjacent to the Salt River on the north, the Consolidated Canal to the south, and a portion of Arizona State Route 202 runs through the area. It also borders the …Lehi is a community within Mesa, Arizona. Lehi existed prior to the founding of Mesa, and was annexed by its much larger former neighbor in 1970. It is now the northern limit of central Mesa. Lehi is adjacent to the Salt River on the north, the Consolidated Canal to the south, and a portion of Arizona State Route 202 runs through the area. It also borders the Salt River Pima-Maricopa Indian Community, and has a long history with it.