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At the request of the Trinity River Restoration Program (TRRP), the Bureau of Reclamation’s Sedimentation and River Hydraulics group developed a two-dimensional hydrodynamic model to predict the spatial patterns of water depth, velocity, and shear stress and to estimate the location, quantity, and quality of salmonid habitat in the Trinity River between Lewiston Dam and the junction with the North Fork. Model development began in the fall of 2013 and the latest version of the model was completed in the summer of 2015. The model has been used to select sites on the river for habitat restoration work, to evaluate proposed restoration designs, and as the hydraulic input to a fish production model. The hydraulic model is based on the surveyed topography and bathymetry of the Trinity River (performed in 2011 and 2012), estimates of channel and floodplain roughness, discharge from Lewiston dam and six tributaries, and the outlet water surface elevation for a given discharge. This report describes the development and analysis of the hydraulic model and the associated habitat module. All model runs described below are steady-state models that simulate a constant discharge over an immobile bed.