Louisiana Department of Transportation and Development (DOTD) announces that the Ouachita River in northeast Louisiana has been designated as a United State Marine Highway (USMH) by the U.S. Maritime Administration (MARAD), an agency of the U.S. Department of Transportation (USDOT). As part of the program, the Ouachita River is designated as M-167 with DOTD as its sponsor. The designation of a ...