The Omohundro Water Treatment Plant, a century old landmark and one of Nashville’s most historically significant water facilities, is undergoing a major modernization effort to secure the city’s raw water supply for decades to come. As part of this renewal, construction of a new raw water intake in the Cumberland River required a technically demanding combination of marine construction, underwater surveying, and controlled rock excavation within a sensitive and tightly regulated environment. A unique blend of marine construction methods, logistical challenges, and engineering innovation supported the underwater blasting and excavation of a 145 foot long, 45 foot wide, 25 foot deep intake pit located 25 feet below the river surface. Following rock removal, two separate 250 foot tunnels were installed from a land based shaft using an 84 inch microtunneling boring machine to convey raw water from the river to the plant. Each tunnel will house a 54 inch ductile iron carrier pipe along with 8 inch stainless steel air burst lines designed to service and clean the intake screens. In parallel with the tunneling operations, the project includes the fabrication and installation of carbon steel intake headers supporting three screens each. Once set, these assemblies will be encapsulated in underwater concrete tremie placement, restoring the river bottom to near original conditions while maintaining structural stability and meeting environmental compliance requirements. Executing this work required precise blast design, real time monitoring, and coordinated marine logistics involving barge mounted drilling equipment, excavation equipment, and diver operations—all within a river system known for rapid flow changes and limited working windows. The integration of modern marine construction practices with a historically significant site demanded a balance of innovation, environmental stewardship, and uninterrupted plant operations. Upon completion of the Raw Water Intake Pump Station, Omohundro will supply 150 MGD of treated water to the Nashville community.