Generally, a stream crossing location is selected during the planning and location phase of a highway project. The final location should be selected only after obtaining detailed survey information and completing preliminary hydraulic studies. Although they are not the sole consideration in bridge location and design, hydraulic aspects should receive major attention in the initial planning of the highway. The location and alignment of the highway can either magnify or eliminate hydraulic problems at the crossing. Adverse conditions should be identified in the early stages of new location selection so that potential problems receive adequate consideration. If the cost of the required structures is prohibitive, consider rerouting the highway.