Which civil engineering dam is directly responsible for the growth of both Los Angeles and Las Vegas?

The Hoover Dam is recognized for its significant impact on the development of major cities in the southwestern United States, particularly Los Angeles and Las Vegas. This dam controls the flow of the Colorado River and provides critical resources such as water and hydroelectric power.

The construction of the Hoover Dam in the 1930s created Lake Mead, which serves as a vital water supply for municipalities and agricultural irrigation in the surrounding regions. By ensuring a reliable water source, the dam facilitated rapid population growth and urbanization in Los Angeles and Las Vegas, which were previously constrained by their limited water resources. This access to water and power was instrumental in accommodating the increasing population and promoting economic opportunities, thereby directly contributing to the cities' growth.

In contrast, other dams listed do not have a similar direct influence on Los Angeles or Las Vegas. Glen Canyon Dam, while important for water storage and hydropower, primarily serves different areas. Oroville Dam and Grand Coulee Dam also do not have the same level of direct impact on the growth of these particular cities. Thus, Hoover Dam stands out for its critical role in supporting the development of both Los Angeles and Las Vegas.