bridge
The term “bridge” means a lawful bridge over navigable waters of the United States, including approaches, fenders, and appurtenances thereto, which is used and operated for the purpose of carrying railroad traffic, or both railroad and highway traffic, or if a State, county, municipality, or other political subdivision is the owner or joint owner thereof, which is used and operated for the purpose of carrying highway traffic.
Source
33 USC § 511
Scoping language
None identified, default scope is assumed to be the parent (subchapter II) of this section.