This paper presents the software architecture of the web-based application developed to visualize the marine highway routes of the US Intermodal Port Network (MIPN). The marine highways are being construed as effective alternatives for the traffic-congested interstate roads in the US. The MIPN comprises of 89 ports - 21 of which are core ports that are located on two or more marine highways and the rest of the ports are stub ports that are located in only one marine highway and are connected to the closest core port in that highway. The MIPN is modeled as an undirected graph featuring the core ports and stub ports, and the edges (marine highways) connecting them, as described above. Referred to as the Marine Highway Route Planner application, it displays interactive maps using OpenStreetMaps and OpenLayers. The application uses React JS, NodeJS and Azure Cloud technologies as a part of its core architecture. We use custom port markers, route path attributes and marine highway layers to display relevant visual information.