Our experience with water quality and hydrodynamic modeling is focused on pollutant transformations over the watershed scale, and involves processes that create cumulative effects. Remotely sensed data offer spatially continuous inputs for analysis and modeling and are used extensively in our modeling efforts. LiDAR and hydroacoustics offer high-resolution, spatially continuous inputs for analysis and modeling. Thermal infrared imagery provides baseline calibration data for reach- and basin-scale stream temperature models such as Heat Source. Heat Source is a stream temperature / shade model designed to accommodate high resolution spatial data inputs, and was written by Matthew Boyd and Brian Kasper, both of WSI. Steam morphology, temperature, and near stream land cover data can be sampled using TTools, an automated GIS tool designed to assemble Heat Source input databases.