There are roughly 75,000 dams in the US today. This compilation explores the legacy and landscapes left behind by these obstructions that abruptly block the flow of rivers, effectively hindering sediment and nutrient transport, blocking fish passage, degrading water quality, and reducing the amount of water available to aquatic life that depend on these processes. Though dams address many human needs, we already possess a diverse set of alternatives with which to satisfy many of these demands without existing dams, and especially without new ones