As environmental devastation in the Mono Basin gathered speed, local resistance gathered force. Scientists who studied the unique geologic and biological resources in the area raised the alarm of impending ecologic collapse. Residents feared for their health and their livelihoods, as water exports eroded the lake at the center of their public lands tourism economy. Gradually, a coalition of locals, students, scientists, birders, fishers, hunters, lawyers, politicians, and government agency staff coalesced around the idea that something had to be done. This chapter explores how that unlikely coalition joined together to mobilize political support for the lake’s preservation, reviewing the origins of the Mono Lake advocacy movement and the strategic legal and political choices they made in laying foundation for the eventual litigation.Volunteers launched a state-wide campaign to “Save Mono Lake,” raising awareness while cultivating relationships with the Angelenos who relied on exported Mono Basin water. The campaign eventually drew inspiration from a good idea, published by a legal scholar and championed by a student who read it in college: the common law public trust doctrine.