Abandoned adobe buildings at the Mormon Fort site (now known as the Old Mormon Fort), Las Vegas, Nevada. Site Name: Las Vegas Mormon Fort (Las Vegas, Nev.)

A view of the Callville ruins at Lake Mead, Nevada. Callville is a former settlement of Clark County, Nevada. Abandoned in 1869, Callville was submerged under 400 feet (120 m) of water after the Colorado River was dammed to form Lake Mead. Callville Bay recreation area is located at the site. Located 350 miles (560 km) from Salt Lake City, Calville was situated on the west bank of the Colorado River, in what was at the time Pah-Ute County, Arizona Territory. The main road to the settlement was along the Virgin River close to St. Thomas, Nevada before heading over hills to the west. A road connected Callville with the main highway at Las Vegas. Callville was established in December 2, 1864 by Anson Call, Dr. James M. Whitmore, A. M. Cannon, Jacob Hamblin and son. It was at the time the southernmost outpost of Mormon settlement. Callville was one of seven Mormon settlements on or near the Muddy River, the others being St. Thomas, Saint Joseph, Overton, West Point, Mill Point later Simonsville and Rioville on the Colorado River above its confluence with the Virgin River. Callville became the county seat of Pah-Ute County, Arizona Territory, in December 1865, before the seat was moved on October 1, 1867 to St. Thomas.