Final answer:
Nevada is the state with Pyramid Lake, Lake Mead, Lake Mojave, Lake Tahoe, and Walter Lake. Lake Mead is the largest reservoir in the U.S and is essential for Las Vegas' water supply, which faces potential water shortages due to drought and high demand.
Step-by-step explanation:
The state that has Pyramid Lake, Lake Mead, Lake Mojave, Lake Tahoe, and Walter Lake is Nevada. Among these, Lake Mead stands out as the largest reservoir in the U.S., which is crucial for water supply in the region, particularly for cities like Las Vegas. Lake Mead and other bodies of water in Nevada are significant both for their natural beauty and for their roles in the region's water management.
Concerns about water sustainability are growing due to factors such as drought and increased water demand. Las Vegas, for example, relies on Lake Mead for 90 percent of its water. This water originates from snowmelt in the Rocky Mountains and is delivered to the lake via the Colorado River. Despite efforts to reduce water usage and recycle sewage water, dropping water levels in Lake Mead indicate a potential future water crisis for the area.