The sign at the middle of the bridge in the middle of the photo is actually the sign for the Mexican border...
This was the original boundary, the new one was created when the two countries decided to split the cost of running the Rio Grande inside a cement culvert.
There is a fairly large park here, and they have several multi-cultural events on the grounds throughout the year.
Watched a movie about the process, and got 4 stamps here, 3 for the memorial and one for the El Camino Real Trail. Also got a park pin.
Here is the website from the NPS for here: