The river then flows across the northwestern corner of Arizona through the Virgin River Gorge and past the towns of Beaver Dam and Littlefield.
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If water level then drops, it may lower below the penstock openings, which are higher up on the dam face, then the release capacity of the dam drops to zero, and the Colorado River below the dam could remain dry until the next major spring inflow, and only springs, seeps and tributaries such as the Paria, Little Colorado and Virgin River would replenish its flow during these times, perhaps causing unprecedented drops in levels of Lake Mead as well.
The Virgin River Gorge, located between St. George, Utah, and Littlefield, Arizona, is a long canyon that has been carved out by the Virgin River in northwest Arizona.
Protected populations occur in the Virgin River and its tributaries in Zion National Park.
Interstate 15 runs through the canyon and crosses the Virgin River several times.
Populations are known at various locations in the Virgin River system, including the North Fork and East Fork of the Virgin River in Zion National Park, the Santa Clara River, Beaver Dam Creek, and Ash Creek.
The Virgin spinedance is also found in Mohave County, Arizona, in the lower Beaver Dam Wash to its confluence with the Virgin River at Littlefield.
Historically, the woundfin occupied much of the lower Colorado River basin, including two tributaries, the Virgin River and part of the Gila River; however, habitat destruction through dams and water development has led to its extirpation from these regions.