AbstractA precolumbian Maya dock and dam complex was located on the Río Hondo in northwestern Belize near the site of Blue Creek. Survey and excavation showed a range of activities to be associated with the complex, including lithic raw material procurement and manufacture. The discovery also underscores Blue Creek’s role in long-distance commercial exchange involving lowland riverine systems. Large quantities of exotic commodities, including jadeite from the Motagua River valley in Guatemala and stone tools from the industrial manufacturing site of Colhá, Belize, have been recovered from Preclassic and Classic period deposits at Blue Creek, and the site is posited as a vital point of transshipment responsible for the filtering of peripheral resources into the central lowlands. The Blue Creek dock and dam provides a rare glimpse of Maya riverine architecture and offers tangible evidence of infrastructural supports associated with maritime commerce.