In order to more accurately map the topo-bathymetric surface along the Sandy River in Oregon, we developed a customized software solution - Dewberry's Lidar Processor (DLP) - to process Lidar data. The DLP includes a tool that allows for the correction of the refraction of laser light as it enters the water using multi-wavelength Lidar, as well as a point-to-point comparison and other analysis tools for processing topo-bathymetric Lidar data. We used the DLP to create a seamless topo-bathymetric surface along the Sandy River, measuring depths ranging from zero to three meters.