Lake Mohave, situated directly below Hoover Dam and formed by Davis Dam, faces a critical threat if Lake Mead reaches its "dead pool" elevation. This grim scenario, where Lake Mead's water can no longer flow through Hoover Dam, would directly impact Lake Mohave, which relies almost entirely on releases from its upstream neighbor. At 895 feet elevation, "dead pool" signifies the point where water is effectively trapped behind Hoover Dam, unable to be gravity-fed through its outlets. As of 2026, Lake Mead sits at approximately 1,040 feet, which is near its record low but still over 140 feet above this critical threshold.
Lake Mohave, spanning the Arizona-Nevada line, forms part of the Lake Mead National Recreation Area, attracting boaters and anglers. However, its primary water source is Lake Mead's outflows; Davis Dam primarily re-regulates this water and passes it downstream. It effectively functions as a holding tank for Lake Mead's releases. If releases from Hoover Dam were to cease, Lake Mohave would initially maintain its volume. The reservoir currently holds about 1.8 million acre-feet of water behind Davis Dam. This stored volume would allow water to continue flowing downstream to Arizona, California, Nevada, and Mexico for a period.
However, without continuous replenishment from Lake Mead, Lake Mohave would steadily drain as Davis Dam continued to release water to meet downstream demands. This process would effectively sacrifice Lake Mohave, emptying it to provide a temporary buffer for the Lower Basin states before it, too, would ultimately run dry. Reservoirs like Lake Mohave do not offer long-term protection once Lake Mead's releases cease; they merely delay the broader water crisis. The ecological repercussions of such an event would be severe. Lake Mohave is recognized as the most vital stronghold for the endangered razorback sucker, hosting the largest wild population of this native fish remaining globally. Annually, biologists work to collect tens of thousands of razorback sucker larvae from Mohave's shoreline to raise them in protected environments, an ongoing effort to prevent the species' extinction. The bonytail chub, another native Colorado River fish listed as endangered, also depends significantly on Lake Mohave's habitat. The draining of the lake would eliminate one of the most critical refuges for native fish throughout the Southwest.
The impacts would not stop at Lake Mohave. The interconnected system means Lake Havasu, located downstream and held by Parker Dam, would be the next reservoir affected. Lake Havasu serves as a crucial intake point for the Central Arizona Project, which supplies water to urban centers such as Phoenix and Tucson. It also feeds the aqueduct that transports Colorado River water across the desert to Los Angeles and San Diego. Similar to Lake Mohave, Lake Havasu would be depleted to sustain water deliveries before eventually failing. The loss of water flow would also mean Davis and Parker dams would cease generating hydropower, leaving the entire lower Colorado River basin, along with Mexico’s treaty water allocations, without a reliable source. A unique exception noted is that Las Vegas constructed a deep intake capable of pumping water from Lake Mead even if levels fall below the dead pool threshold.
Despite these stark possibilities, water managers indicate that this scenario represents a genuine worst-case outcome, not an imminent threat. Lake Mead's current elevation, at approximately 1,040 feet, remains over 100 feet above the dead pool level. Water managers are actively working to maintain these levels, implementing conservation measures that have saved millions of acre-feet of water. A new set of operating rules is also in place through 2036, designed to prevent the progression towards a dead pool condition. However, the potential fate of Lake Mohave vividly illustrates the broad implications of Lake Mead reaching dead pool, emphasizing that it would not be an isolated problem but one that would cascade significantly downstream.