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1. National Bridge Inventory: United States, 2011

2011. United States. Federal Highway Administration, Lubkin, Samantha , Blades, Doug, and United States. Bureau of Transportation Statistics. This point shapefile depicts the more than 600,000 of the United States' bridges located on public roads, including interstate highways, United Sta... United States. Bureau of Transportation Statistics.

2. Waterway Locks: United States, 2013

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.