The location is not located correctly on the map. The bridge was at the end of Second Ave (Manhattan). It had two decks, each carrying two tracks. It was a swing bridge rotating on a center pier. This bridge (1917) replaced an earlier one-deck bridge (1886) at the same location. Train service ended in 1955 after which the bridge was removed.
Just a correction:
I was informed a while back after I posted in 2018 that the wall I mention was not from the 3rd Avenue El but rather an earlier section of the Willis Avenue Bridge.
The bridge may be gone but on of the stone support walls on the Bronx side is still in place. The area around it is no longer in the water as it was land-filled for the supports for the Willis Avenue Bridge.
The location is Willis Avenue & E132nd St.
The location is correct. The bridge at 2nd Avenue (see IRT - Harlem River Second Avenue Bridge BH 94982) was a single level swing bridge.