In this paper, Matt Nahorniak lays out how we took advantage of open-source Delft3D to automate the process of computational mesh generation from high resolution topography for reaches. We automated this for the generation of hydraulic models for over 5000 site visits in the Columbia Habitat Monitoring Program (now defunded by BPA) and automated these simulations on Amazon Web Services (AWS EC2). While we are no longer running these simulations for CHaMP, all those model runs (and the 950+ sites from which they came) are publicly available and the source code is open source. This technique is a game changer for properly leveraging high resolution topography of rivers to realize the vision laid out in Wheaton et al. (2017).