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Riverside Shipyard was the Starfleet Shipyard 2-1A construction facility located in Sector 47 Riverside, Iowa, Earth. In the alternate reality, the USS Enterprise was constructed there in the 2250s. The shipyard was the location from where cadets for Starfleet Academy embarked. (Star Trek)
Background information
According to co-writer Roberto Orci, the shipyards were constructed in Iowa in honor of George Kirk's sacrifice on the USS Kelvin: "Shortly after the heroic death of George Kirk, the Iowa shipyards were erected by Starfleet to honor and commemorate the sacrifice. Hence, the Kelvin salt shaker in the diner, etc…."[1]