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New Zealand mud snails (Potamopyrgus antipodarum) were first introduced to the United States in 1987 and have subsequently invaded water bodies across the United States. At high densities, P. antipodarum can outcompete native fauna, disrupt community interactions, and alter ecosystem function, making them a threat to aquatic habitats worldwide. In this paper, we detail the invasion, population dynamics, and secondary production of P. antipodarum at seven sites in the Green River below Flaming Gorge Dam (0.8–49 km below the dam). New Zealand mud snails were first detected in the Green River in 2001. For more than a decade, densities of P. antipodarum in the Green River remained relatively low (< 1200 individuals m⁻²) at all sites. However, in 2015 densities started to increase dramatically at three sites below the dam, eventually reaching > 19,000 individuals m⁻². Annual secondary production …