2013. United States. Bureau of Transportation Statistics. This map layer portrays major dams of the United States, including Puerto Rico and the U.S. Virgin Islands. The map layer was created by extracting... Research and Innovative Technology Administration/Bureau of Transportation Statistics.
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2013. United States. Bureau of Transportation Statistics. The ports are politically defined by port limits or Corps projects, excluding non-Corps projects not authorized for publication. The determination ... Research and Innovative Technology Administration/Bureau of Transportation Statistics.
2013. Institute for Water Resources (U.S.). Navigation Data Center. This point shapefile contains the locations of waterways locks in the United States. The Navigation Data Center had several objectives in developin... United States. Bureau of Transportation Statistics.