Hi River Construction Welcome to Hi River Construction! We have been in business for over 30 years. We specialize in engineered septic systems, but we also do all phases of dirt work and concrete prep. We dig pools, build fountains, build rock walls, roads, driveways, push outs for buildings and the list goes on. If you have a project in your future involving dirt work then Hi River is the company to get it done! We also have our own trucks for hauling. In most cases we have everything needed for a project from beginning to finish.