Abstract: Within the context of complex, interconnected, multimodal transportation, the US Army Corps of Engineers (USACE) provides safe, reliable, efficient, effective, and environmentally sustainable waterborne transportation systems for the movement of commerce, national security needs, and recreation. Understanding the role of waterways within the multimodal transportation system would allow for comprehensive resource allocation, including dredging prioritization. In 2022, approximately 19,810 million tons of goods were transported within, to, and from the US, with truck being the dominant mode for the domestic portion of the trip (64 percent). Relatively recent legislation calls for a multimodal representation of freight, one that facilitates transportation planning and asset management. However, traditional data collection and analysis has focused on single modes, preventing nationwide, multimodal representations of commodity flows. This report presents major commodity corridors within, to, and from the US by combining diverse sources and homogenizing data dimensions. The resulting information and commodity-specific maps help to contextualize waterborne navigation’s role within the broader multimodal transportation system. A key finding from the study indicates that the mouth of the Mississippi River in Louisiana carried in 2019 more volume of freight annually than any other waterway, railroad, or highway segment in the US.