The former SP double track swing bridge over the Sacramento River near the Calif. State Railroad Museum is now manned by a UP operator. The huge SP lift bridge over Suisan Bay in the San Francisco bay area is manned by a operator that is on-call from nearby Martinez. I believe that the double track lift bridge leading into Portland Union Station in Oregon is manned, as well as the drawbridge on the BNSF near the locks just north of Seattle. I am not aware of any functioning bridges in the west that are not controlled and manned locally.
Bridge tender on duty in Toledo, OH on the NS Chicago Line where it crosses the Maumee River. Also in Toledo, OH, a bridge tender on the CSX’s Toledo Terminal Lower River Bridge over the Maumee River during navigation season.
There is a bridge tender on duty in Detroit, MI on the Delray Connecting RR, Conrail Shared Assets and the NS bridges that cross the Rouge River
The BNSF Colombia River bridges at Vancouver ,WA, and Wishram,WA are both manned.
Seminole Gulf in Ft. Myers, Fl still has a bridgetender.
The CN bridge in Oshkosh, WI has a bridgetender during the boating season.
I believe there is a bridge over the Chesapeake and Delaware canal that is manned. The NS runs trains over that bridge. Its in Delaware.