Stock photography, photos: Lock and dam sites on the Mississip Stock photos of Lock and dam sites on the Mississippi River allows for barges to navigate Photograph: © Dennis MacDonald Click for a larger image and more information Keywords associated with this stock photo: Business, Commerce, Selling, Sales, Economics, Money, Cash, Trade, Industry, Company, Retail, Vendor, Financial, Finance, Promote, Promotion, Products, buying, exchange, retail, wholesale, Transportation, transport, carrying, moving, haulage, hauling, shipping, vehicle, move, travel, ship