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In 1851, Leroux guided the Lorenzo Sitgreaves expedition through Arizona, advising them to explore the Little Colorado River valley, where the party came across the Wupatki ruins built by prehistoric Indians.
As an engineer, he determined the boundary lines between Iowa and the Little Colorado River, surveyed routes for a railroad from the Mississippi River to the Pacific Ocean, and was the chief surveyor of the party charged with the delineation of the boundary of the northwest United States and British North America, 1857–1861.
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.
He later returned to Utah Territory and married Anna Maria Jensen in 1876, then moved his family to Arizona, to an isolated cabin on the Little Colorado River near Tuba City, on the present-day Navajo reservation.