While IceCube’s detection astrophysical neutrinos at energies up to a few PeV has opened a new window to our Universe, much remains to be discovered regarding these neutrinos’ origin and nature. In particular, the difficulty differentiating electron and tau neutrino charged-current (CC) events in the energy limits our ability to measure precisely the flavor ratio of this flux. The Tau Air-Shower Mountain-Based Observatory (TAMBO) is a next-generation neutrino observatory capable of producing a high-purity sample of tau neutrino CC events in the energy range from 1-100 PeV, i.e. just above the IceCube measurements. An array of water Cherenkov tanks and plastic scintillators deployed on one face of the Colca Canyon will observe the air shower produced when a charged tau lepton, produced in a tau neutrino CC interaction, emerges from the opposite face and decays in the air. In this contribution, I will present the current status of the TAMBO simulation, including preliminary sensitivities to various flux models.