This Article uses a detailed case study of the Chesapeake to describe an emergent model of intergovernmental administration tailored to address our largest-scale environmental problems. The Obama EPA’s “total maximum daily load” (“TMDL”) in the Chesapeake has yet to be replicated. But it should be. The TMDL and its supporting norms were unique as an operational plan, achieving a level of transparency, accountability, means/ends rationality, and continuous improvement that were unprecedented at its scale. And whether this model can be replicated elsewhere turns out to be as much a question of law as of politics.