Swallow Bay

Callville Bay is a waterway on the northwestern side of Lake Mead in the U.S. state of Nevada. It has a marina and camping resort. Situated east of Las Vegas and upstream from Las Vegas Bay, it lies within the Lake Mead National Recreation Area, which was established in 1935. Its name derives from the settlement of Callville which was established in 1865 by Anson Call under a directive led by Brigham Young. Though the settlement was abandoned in 1869, and submerged under Lake Mead when the Colorado River was dammed, Callville Bay retained the name.

Boulder Basin is the westernmost of the three basins occupied by the Lake Mead reservoir and lies within the boundaries of Clark County, Nevada and Mohave County, Arizona. It includes the area between Hoover Dam and the mouth of Boulder Canyon at Auxiliary Point. When the reservoir is full it reaches an elevation of 1,204 feet (367 meters). It includes Las Vegas Bay, Swallow Bay, Callville Bay and Hamblin Bay.

West End Wash is an ephemeral stream or wash in Clark County, Nevada. Its mouth is at its confluence with the Callville Wash of Lake Mead at an elevation 1,250 feet (380 meters) at when Lake Mead is at its full level. Currently as the reservoir is at a much lower level its mouth is found at approximately 36°08′24″N 114°42′57″W. Its source is at 36°15′55″N 114°43′58″W at 3,083 feet (940 meters) in the Gale Hills.West End Wash was originally a tributary of Callville Wash, known as West Fork Callville Wash, whose confluence with Callville Wash is now under Callville Bay. Following the creation of Lake Mead it now flows into Callville Bay, at 36°08′24″N 114°42′57″W and was renamed West End Wash.

Callville is a former settlement of Clark County in the U.S. state of Nevada. Abandoned in 1869, it was submerged under Lake Mead when the Colorado River was dammed, Callville Bay retaining the name. At one time, it was noted to be the southernmost outpost of the Mormon settlement.

Boulder Canyon, originally Devils Gate Canyon, is a canyon on the Colorado River, above Hoover Dam, now flooded by Lake Mead. It lies between Clark County, Nevada and Mohave County, Arizona. It heads at western end of the Virgin River Basin of Lake Mead, at about 36°09′05″N 114°32′51″W. Boulder Canyon divides the Black Mountains into the Black Mountains of Arizona, and the Black Mountains of Nevada. Its mouth is now under the eastern end of the Boulder Basin of Lake Mead, between Canyon Point in Nevada and Canyon Ridge in Arizona. Its original mouth is now underneath Lake Mead between Beacon Rock and Fortification Ridge on the southern shore in Arizona.

Fortification Rock, once a landmark hill on the Colorado River before it was inundated, now known as Rock Island, southernmost and tallest of the Boulder Islands in Lake Mead, Clark County, Nevada. It has an elevation of 1284 feet. Fortification Rock appears on the 1861 Geological Map No. 1; Rio Colorado of the West, explored by 1st Lieut. Joseph C. Ives, which shows Fortification Rock, Ives Camp #59 and the course of the Colorado River from its mouth on the Gulf of California to Las Vegas Wash and the location of its features and other expedition camps along the way.

Auxiliary Point is a cape in the Lake Mead reservoir in Clark County, Nevada. Auxiliary Point marks the mouth of Boulder Canyon, a canyon on the Colorado River, above Hoover Dam, now flooded by Lake Mead.

Fortification Hill is a prominence adjacent to Lake Mead in the Lake Mead National Recreation Area; it is located at the northwest terminus region of the Black Mountains (Arizona), and specifically the north region of the Black Mountains. It is near a southern section of Lake Mead, and just northeast of Hoover Dam. It can easily be seen eastward across Las Vegas Bay or from the two northern mountain terminuses of Eldorado Mountains (Nevada), or the Black Mountains (Arizona). The mountain prominence is plateau-like, or mesa-like with its highpoint at the southeast terminus, and sloping north and northwestwards toward Lake Mead. The prominence is 3,719 feet (1,134 m).The flat mountaintop, sloping northwards is composed of Tertiary basaltic lava flows.

Hoover Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona. Constructed between 1931 and 1936, during the Great Depression, it was dedicated on September 30, 1935, by President Franklin D. Roosevelt. Its construction was the result of a massive effort involving thousands of workers, and cost over 100 lives. In bills passed by Congress during its construction, it was referred to as the Hoover Dam, after President Herbert Hoover, but was named the Boulder Dam by the Roosevelt administration. In 1947, the name Hoover Dam was restored by Congress. Since about 1900, the Black Canyon and nearby Boulder Canyon had been investigated for their potential to support a dam that would control floods, provide irrigation water and produce hydroelectric power. In 1928, Congress authorized the project. The winning bid to build the dam was submitted by a consortium named Six Companies, Inc., which began construction in early 1931. Such a large concrete structure had never been built before, and some of the techniques used were unproven. The torrid summer weather and lack of facilities near the site also presented difficulties. Nevertheless, Six Companies turned the dam over to the federal government on March 1, 1936, more than two years ahead of schedule. Hoover Dam impounds Lake Mead and is located near Boulder City, Nevada, a municipality originally constructed for workers on the construction project, about 30 mi (48 km) south-east of Las Vegas, Nevada. The dam's generators provide power for public and private utilities in Nevada, Arizona, and California. Hoover Dam is a major tourist attraction, with 7 million tourists a year. The heavily traveled U.S. Route 93 (US 93) ran along the dam's crest until October 2010, when the Hoover Dam Bypass opened.

The Mike O'Callaghan–Pat Tillman Memorial Bridge is an arch bridge in the United States that spans the Colorado River between the states of Arizona and Nevada. The bridge is located within the Lake Mead National Recreation Area approximately 30 miles (48 km) southeast of Las Vegas, and carries Interstate 11 and U.S. Route 93 over the Colorado River. Opened in 2010, it was the key component of the Hoover Dam Bypass project, which rerouted US 93 from its previous routing along the top of Hoover Dam and removed several hairpin turns and blind curves from the route. It is jointly named for Mike O'Callaghan, Governor of Nevada from 1971 to 1979, and Pat Tillman, an American football player who left his career with the Arizona Cardinals to enlist in the United States Army and was killed in Afghanistan in 2004 by friendly fire. As early as the 1960s, officials identified the US 93 route over Hoover Dam to be dangerous and inadequate for projected traffic volumes. From 1998 to 2001, officials from Arizona, Nevada, and several federal government agencies collaborated to determine the best routing for an alternative river crossing. In March 2001, the Federal Highway Administration selected the route, which crosses the Colorado River approximately 1,500 feet (460 m) downstream of Hoover Dam. Construction of the bridge approaches began in 2003, and construction of the bridge itself began in February 2005. The bridge was completed in 2010 and the entire bypass route opened to vehicle traffic on October 19, 2010. The Hoover Dam Bypass project was completed within budget at a cost of $240 million; the bridge portion cost $114 million.The bridge was the first concrete-steel composite deck arch bridge built in the United States, and incorporates the widest concrete arch in the Western Hemisphere. At 890 feet (270 m) above the Colorado River, it is the second highest bridge in the United States after the Royal Gorge Bridge near Cañon City, Colorado, and is the world's highest concrete arch bridge.

Las Vegas Bay is a bay at the western edge of Lake Mead in the U.S. state of Nevada. The bay is located within the Lake Mead National Recreation Area to the northeast of the city of Henderson, Nevada, near the junction of Lake Mead Drive and Lake Mead Boulevard. A public campground and boat access are available in Las Vegas Bay. Low water levels of Lake Mead have rendered the marina there inoperable, and it has moved to the Hemenway Boat Harbor, in the south end of the Boulder Basin. The launch ramp there has also been closed due to the water levels. The bay is the natural discharge point for the Las Vegas Wash.

Gypsum Wash is an ephemeral stream or wash in Clark County, Nevada. Gypsum Wash was originally a tributary of Las Vegas Wash before the formation of Lake Mead which submerged their confluence under Las Vegas Bay. Due to the lowering of the reservoir over recent years Gypsum Wash is once again a tributary of Las Vegas Wash, now exposed at 36°07′04″N 114°50′54″W at an elevation of 1085 feet. When Las Vegas Bay is at its full level, Gypsum Wash flows into Lower Gypsum Wash Cove at 36°07′43″N 114°51′26″W at an elevation of 1,204 feet (367 meters).Gypsum Wash has its source in the Dry Lake Range, at 36°20′45″N 114°52′08″W at an elevation of 3,120 feet (950 meters).